abyss - without bottom; achromatic - without color; anhydrous - without water

afire - on fire; ashore - on the shore; aside - on the side

abduct - carry away by force; abnormal - away from normal, not normal; absent - away, not present; aversion - the act of turning away from; abbreviate: to shorten

accelerate, accumulate, advocate

acrobat, acronym, acropolis

activity - something that a person does; react - to do something in response; interaction - communication between two or more things

aerate - to let air reach something; aerial - relating to the air; aerospace - the air space

agriculture, agrarian, agronomy

analgesic, neuralgia, nostalgia

ambidextrous - able to use both hands equally; ambiguous - having more than one meaning; ambivalence - conflicting or opposite feelings toward a person or thing

amble - to walk in a slow, relaxed way; ambulant - walking or moving around; ambulance - a vehicle that moves a patient

amiable - friendly, pleasant, lovable; amity - friendly and peaceful relations; amorous - showing romantic love

anatomy, analysis, anachronism

androgynous - being both male and female; android - resembling a human; misandry - hatred towards men

animal - a living organism; animate - to make alive; equanimity - of balanced spirit

anniversary - a date observed once a year; annual - happening once a year; millennium - 1,000 years

antecede - to come before something in time; antemeridian - before noon; anteroom- a small room before the main room

chrysanthemum and amaranth - names of flowers; anthology - a collection of treasured writings; anthozoan - half plant, half animal, like anemones and corals

anthropology - the study of mankind; anthropomorphism - giving human form to non-human things; philanthropy - the love to mankind (expressed through good deeds)

antibody - a substance that destroys micro-organisms; antiseptic - preventing infection; antisocial - opposing social norm

aphorism - a short expression of a general truth; apology - an explicit expression of regret, apostrophe - a small dash used in place of an omitted letter

aquarium - a water container for fish; aquatic- relating to water; aqueduct - a pipeline for water

arboreal, arboretum, arbor

archbishop - the highest ranking bishop; archenemy - chief or worst enemy; matriarch - a female who rules a group; monarch - a king or queen

archaeology - the study of ancient cultures; archaic - belonging to an earlier period; archive - a collection of historical materials

arthritis, arthropod, arthroscopy

artifact - object made by a person's skill; artisan - a person skilled in a craft; artist - a person who creates skillfully

astronaut - a person traveling to the stars; astronomer - someone who studies the stars; asterisk - a star-shaped sign used as a reference tool

audible - loud enough to be heard; audience - people who listen to a program; audiovisual - relating to sound and vision

autocrat - a person who governs with absolute power; autograph - a person's own signature; automatic - moving by itself

aviary - a large enclosure for birds; aviatrix - a female airplane pilot; aviation - the art of designing or operating aircraft

baric - pertaining to pressure, esp. of the atmosphere; milliard - metric unit, equal to 1/1000th of a bar; baryon - heavy elementary particle

bellicose - warlike; belligerent - hostile, ready to fight; rebel - person who opposes and fights

benefactor - person who gives money to a cause; beneficial - producing a good effect; benevolent - showing kindness or goodwill

biannual - happening twice a year; binoculars - optical device with two lenses; bilateral - of or involving two sides

bibliography - a list of books used as sources; bibliomania - an extreme love of books; bibliophile - a person who loves books

biography- a life story written by another person; biology - the science of life; biosphere - Earth's surface inhabited by living things

blastula - an early stage of embryonic development; fibroblast - a cell that forms connective tissue; blastoderm - the layer surrounding the inside of an egg

bursar- an administrative officer in charge of funds; bursary- the treasury of a college or monastery; disburse- to expend especially from a public fund

calcite; calcium- the flame of acetylene gas generated by reaction of calcium carbide with water; calcification- impregnation with calcareous matter

candid- free from bias, prejudice, or malice; candle- something that gives light; incandescent- white, glowing, or luminous with intense heat

intercept - to stop or interrupt; accept, receive, capture

cardiac - relating to the heart; cardiogenic - resulting from heart disease; cardiologist - a heart doctor

carnivorous - flesh-eating; carnal - pertaining to the body or flesh; incarnate - given bodily form

catastrophe, catalog, catacomb

caustic, cauterize, holocaust

proceed, succeed, access

accelerate - to increase the speed of; decelerate - to reduce the speed of

centennial- the 100th anniversary; centimeter - 1/100 of a meter; century - 100 years

egocentric - self-centered; eccentric - not having a common center, not according to norm; centrifugal - moving outward from a center

encephalitis - inflammation of the brain; cephalic - pertaining to the head; cephalopod - marine mollusks like octopus and squid who have tentacles growing from their head

cerebral - pertaining to the brain; cerebrate - to use the brain; cerebrospinal - pertaining to the brain and the spinal cord

ascertain- to find out something with certainty; certain - being absolutely sure; certify - to state that something is true

achromatic - without color; chromium - a blue-white metallic chemical element, chromatics - the study of color

chronic - lasting for a long time; chronological - arranging events in time order, synchronize - happening at the same time

chrysanthemum and helichrysum - golden/yellow flowers; chrysolite - a yellowish gem

homicide - murder; incisor - a sharp tooth for cutting food; insecticide - a chemical used to kill insects

circumnavigate - to sail around; circumscribe - to draw around; circumspect - looking around

clamor - to shout and make noise; exclaim - to cry out loudly and suddenly; proclamation - something announced officially in public

clarification - an explanation; clarify - to make something clear; declare - to state something clearly

conclusion - the end or last part; exclusion - shutting out, rejecting; seclude - to keep away from; to isolate

inclination - a leaning toward; incline - a surface that slopes or leans; recline - to lean back and relax

coauthor - writer who collaborates with another author; coeducation - educating males and females together; cohousing - planning your neighborhood in an intentional neighborly fashion

Collaborate - to work together; collision - smashing together; colloquial - words formed by everday interaction

commemorate - to memorize together; composition - an arrangement or putting together of parts; commune - living together while owning things in common

cognition - process of acquiring knowledge; incognito - disguised so no one knows you; recognize - to discover that one knows

connect, continue, conclude

contradict to argue against, Contraflow, contraception, contrary not in agreement, controversy disagreement

corporation - a company recognized by law as a single body; corpse - a dead body; corporal - pertaining to the body

cosmonaut - a Russian astronaut; cosmos - the universe; microcosm - a miniature universe

counteract - to oppose the effects of an action; countermand - to cancel a previous order; counteroffensive - attack against an attack

craniology - the study of skull characteristics; cranium - skull of vertebrates; cranial - pertaining to the skull

credence - belief that something is true or valid; credulous - believing things too easily, gullible; incredible - unbelievable

crucial-characteristic of or having the form of a cross ; crucifix- the cross itself as a Christian emblem; excruciating- so intense as to cause great pain or anguish

cryptic - of hidden meaning; cryptography - science of secret codes; encrypt - encode into secret code

accumulate - to gather or pile up; cumulative - gradually building up

concurrent- running parallel; current- flowing easily and smoothly; cursive- having a flowing, easy, impromptu character

bicycle - a vehicle with two wheels; cycle - a sequence that is repeated; cyclone - a storm with circling winds

decrease, depart, descend

decade - 10 years; decathlon - athletic contest that includes 10 disciplines in which each participant competes; December - formerly the 10th month of the Roman calendar

deciliter - a tenth of a liter; decimate - reduce dramatically; decibel - one tenth of the sound volume unit bel

democracy - government of the people; demographic - the study of people; epidemic - spreading among people in a region

demitasse - a small cup of coffee; demimonde - someone of little respected life style

philodendron - a climbing plant that grows on trees; dendrochronology - dating events by studying growth rings in trees; dendriform - in the shape of a tree

dental - relating to teeth; dentist - a doctor for the teeth; dentures - a set of false teeth

dermatologist - a doctor for the skin; pachyderm - a class of animals with very thick skin (elephant, rhinoceros); dermatitis - inflammation of the skin

dichromatic - displaying two colors; diploma - a certificate, literally "a letter folded double"; dilemma - a situation that requires a choice between two alternatives

displace, dismiss, disagree

diameter, dialogue, diagnosis

contradict - to express the opposite of; prediction - a statement foretelling the future; dictate - to speak out loud for another person to write down

dominate - to be the master of; domineering - excessively controlling; predominate - to have more power than others

donation - a contribution or gift; donor - someone who gives something; pardon - to give forgiveness for an offense

conduct - to lead musicians in playing music; educate - to lead to knowledge; deduction - a subtraction of an amount

duplicate - make an identical copy; duet - a musical composition for two voices or instruments; duo - a pair normally thought of as being together

durable - having the quality of lasting; duration - the length of time something lasts; enduring - able to last

dynamo - a generator of energy; dynamic - having physical energy/power; dynamite - a powerful explosive

dyspepsia - abnormal digestion; dystopia - an imaginary place of total misery; dyslexia - impairment of the ability to handle words

exit, emit, escape

egocentric, ego, egotism

embrace, enable, encourage

endocrine, endoscope, endogenous

bicentennial - of or relating to an age or period of 200 years; centennial - of or relating to an age or period of 100 years; perennial -lasting through many years

enter, internal, include

epidemic, episode, epitome

equidistant - an equal distance from two points; equanimity - calm temperament, evenness of temper; equation - a statement of equality

ergonomics - study of the working environment; energy - the power to accomplish work; energetics - science that looks at energy and its transformation

esthetician - someone who beautifies; aesthetic - pertaining to a sense of beauty; kinesthesia - the sensation of bodily movement

ethnic - pertaining to a defined group of people; ethnocentric - focusing on the ethnicity of people; ethnology - the science of people and races

euphemism - replacing an offensive word with an inoffensive one; euphonious - having a pleasant sound; euphoria - feeling of well-being

excavate - to dig out; exhale - to breathe out; extract - to pull out

extraordinary - beyond ordinary; extraterrestrial - outside the Earth; extrovert - an outgoing person

artifact - an object made by a person; factory - a place where things are made; malefact - a person who does wrong

confer - to bring an honor to someone; ferry - a boat that carries passengers; transfer - to move to another place

confide - place trust in someone, fidelity - faithfulness; fiduciary - a trustee

deflect - to bend course because of hitting something; inflection - a bending in the voice's tone or pitch; flexible - easily bending

florist - someone working with flowers; floral - flowerlike; flora - the plant life of a particular time or area

forsaken or forfeited - completely lost; forgiven - completely given (a release of debt)

forebear - ancestor; forebode - to give an advance warning of something bad; forecast - a preview of events to be

conformity- correspondence in form, manner, or character; formation- something that is formed; reformatory- intended for reformation

fracture, fragment, fragile

fugitive - a person who is running away; refuge - a sheltered place to flee to; refugee - a person seeking protection

defunct - no longer working or alive; function - to work or perform a role normally; malfunction - to fail to work correctly

confusion - being flooded with too much information that is hard to make sense of; fuse - to melt by heating; infuse - to put into

gastric - pertaining to the stomach; gastronomy - serving the stomach by providing good food; gastritis - inflammation of the stomach

generation, genetics, genealogy

geography - study of the earth's surface; geology - study of the structure of the earth; geoponics - soil based agriculture

geriatrics - medicine pertaining to the elderly; gerontocracy - the rule of the elders; gerontology - the science of aging

gigabyte - unit of computer storage space; gigahertz - unit of frequency (one billion Hz/sec); gigawatt unit of electric power (one billion watts)

polygon, pentagon, hexagon

diagram - a simple drawing; grammar - rules of how to write words in sentences; telegram - a message sent by telegraph

granary- a storehouse or repository for grain especially after it is threshed or husked; granola- a mixture of rolled oats and other ingredients; granule- a little grain (as of sugar)

Graphology - the study of handwritings; autograph - written with one's own hand; seismograph - a machine noting strength and duration of earthquakes

gratify - to please someone; grateful - feeling thankful; gratuity - a tip, token of appreciation

gynecology - the science of female reproductive health; gynephobia - fear of women; gynecoid - resembling a woman

digression - a departure from the main issue, subject, etc.; progress - movement forward or onward; gradual - step by step

hectoliter - 100 liters; hectare - metric unit equaling 100 ares or 10,000 square meters; hectometer - 100 meters

helicopter - an aircraft with horizontal rotating wing; helix - a spiral form; helicon - a circular tuba

heliotropism - movement or growth in relating to the sun; heliograph - apparatus used to send message with the help of sunlight; helianthus - genus of plants including sunflowers

hemicycle - a semicircular structure; hemisphere - one half of the earth; hemistich - half a line of poetry

hemorrhage, hemoglobin, anemia

hepatitis - inflammation of the liver; hepatoma - a tumor of the liver; hepatotoxic - toxic and damaging to the liver

heptagon - a shape with seven angles and seven sides; Heptateuch - the first seven books of the Old Testament; heptameter - a line of verse consisting of seven metrical feet

herbicide - any chemical used to kill unwanted plants, etc.; herbivorous - plant-eating; herbal - relating to plants

heterogeneous - made up of unrelated parts; heteronyms - words with same spelling but different meanings; heterodox - not conforming to traditional beliefs

hexagon - a shape with six angles/sides; hexameter - a verse measured in six; hexapod - having six legs

histology - study of the microscopic structure of tissues; histochemistry - study of the chemical constitution of cells and tissues

homogeneous, homosexual, homeostasis

hydrate - to add water to; hydrophobia - intense fear of water; hydroponics - growing plants in liquid nutrient solution; hydraulic - operated by force created by a liquid

hygrometer - tool used to measure humidity; hygrograph - instrument for recording variations in atmospheric humidity

hyperactive, hypertension, hyperbole

hypoglycemia - an abnormally low level of sugar in the blood; hypothermia - abnormally low body temperature; hypothesis - a theory that is unproven but used under the assumption that it is true

geriatrics - medical care of the elderly; pediatrician - a doctor who treats children; podiatry - medical care for feet

icon, iconography, iconoclast

idiomatic - Peculiar to a particular language; idiosyncracy - a physical or mental characteristic typical or a particular person; idiot - someone who is distinctly foolish or stupid

illuminate, include, internal

ignore, illegal, impossible, incorrect, irregular

image - a likeness of someone; imaginative - able to think up new ideas or images; imagine - to form a picture or likeness in the mind

infrared, infrastructure, infractions

international - involving two or more countries; intersection - place where roads come together; intercept - to stop or interrupt the course of

intrastate - existing in one state; intravenous - inside or into a vein; introvert - shy person who keeps within him/herself

irredeemable - not redeemable; irreformable - not reformable; irrational - not rational

isobar - a line on a map connecting points of equal barometric pressure; isometric - having equality of measure; isothermal - having equal or constant temperature

eject - to throw someone/something out; interject - to throw a remark into a discussion; project - to cast or throw something

judgment - a decision of a court of law; judicial - having to do with judges or courts of law; judiciary - a system of courts of law

conjunction - a word that joins parts of sentences; disjunction - a disconnection; junction - a place where two things join

juvenile - youthful or childish; rejuvenate - to bring back to youthful strength or appearance

kilobyte - 1,000 bytes; kilometer - 1,000 meter; kilograms - 1,000 grams

kinetics - study of the force of motion; psychokinesis or telekinesis - the ability to move objects with your mind; cinematography - motion picture making

collaborate - to work with a person; elaborate - to work out the details; laborious - requiring a lot of hard work

lactate - to give milk, nurse; lactose - the sugar contained in milk; lactic acid

bilateral - of or involving two sides; unilateral - affecting one side of something

leukemia - abnormal increase of white blood cells in the blood; leukocyte - a mature white blood cell; leucine - a white, crystalline amino acid

lexicology - the study and history of words; alexia -loss of the ability to read; illegal - not authorized by the official rules or laws

liberate - to set free; libertine - a person with a free, wild lifestyle; liberty - freedom

linguist - one who studies languages; multilingual - able to communicate in multiple languages; linguine - long, flat "tongue-shaped" pasta

liposuction - the mechanical removal of fat reserves in the tissue; lipase - enzyme that breaks down fat; lipoid - resembling fat

apatite - a group of common minerals; granite - a hard, granular rock; monolith - a remarkable, unique stone

dislocate - to put something out of its usual place; location - a place; relocate - to move to a new place

logic - correct reasoning; monologue - a long speech by one speaker;analogy - similarity, especially between things otherwise dissimilar

eloquent - speaking beautifully and forcefully ; loquacious - very talkative; elocution - art of public speaking

elucidate - to explain, to throw light on; lucid - easily understood, giving off light; translucent - allowing light through

prelude - introduction to the major performance; illusion - misleading optical image or impression; delude - to mislead, deceive

illuminate - to fill with light; lumen - unit measuring light

lunar - relating to the moon; lunarscape - the surface of the moon; lunatic - insane (as if driven mad by the moon)

macroevolution - large scale evolution; macromolecule - a large molecule; macroeconomics - study of the overall forces of economy

magnify - make larger; magnificent - grand; magnate - a powerful person, especially in business or industry

malcontent - wrong content; malaria - "bad air", infectious disease thought to originate from the "bad air" of the swamps, but caused by the bite of an infected mosquito; malicious - showing strong ill will

maneuver - to move by hand; manual - done with the hands; manuscript - a book written by hand

command - an order or instruction; demand - a hard-to-ignore order; mandate - an official order

kleptomania, pyromania, bibliomania

marine, maritime, submarine

maternal - relating to motherhood; maternity - the state of being a mother; matriarch - a woman head of a household

maximal - the best or greatest possible; maximize - to make as great as possible; maximum - the greatest amount

medieval - pertaining to the Middle Ages; medium - in the middle; mediocre - only of medium (inferior) quality

megalopolis - an area with many nearby cities; megaphone - a device that projects a loud voice; megastructure - huge building or other structure

melancholy - a state of dark emotions; melanoma - malignant dark tumor of the skin; melodrama - a dark, pathetic drama

commemorate - to honor the memory of, as by a ceremony; memorial - related to remembering a person or event; memory: an ability to retain knowledge or an individual's stock of retained knowledge

immerge or immerse - to put or dip something into a liquid; submerge to dip something completely into water

mesosphere, mesozoic, mesopotamia

metaphysics - study of nature and reality; metamorphosis - a complete change of form; metastasis - the transmission of disease to other parts of the body

audiometer- an instrument that measures hearing acuteness; chronometer- an instrument that measures time; metric - measured

microbe - a very small living thing; microchip - a tiny wafer with an integrated circuit; microscope - a device to see very small things

midnight, midpoint, midway

immigrant - a person who moves to a new country to settle; migrant - person who moves from place to place; migration - the process of moving

millimeter - one thousandth of a meter; millibar - one thousandth of a bar; milliliter - one thousandth of a liter

mini - something that is very small; minuscule - extremely tiny; minutiae - very small or trivial details

misanthrope, misogyny, mistake

dismiss - to send someone away; missile - a weapon sent into the air; emit - to send something out; admittance - entry

immobilize - to stop from moving; mobile - able to move freely; mobility - the quality of being able to move

monochromat - having one color; monologue - a speech spoken by one person; monotheism - belief in one god

motion - the act of moving; motivate - to move someone to action; promote to move someone forward; removable - able to be taken or carried away

metamorphosis - complete change of form; endorphins - chemical in the brain able to transform pain; amorphous - without distinct shape or form

immortal - living forever, unable to die; mortal - certain to die; mortician - an undertaker

multicolored - having many colors; multimedia - using a range of media; multitasking - doing many things at once

immutable - not changing; mutant - an organism that has undergone change; mutate - to undergo a change

myocardium - the middle muscle of the heart; myasthenia - muscle fatigue or weakness; myosin - common protein in muscle tissue

narrate - to tell a story; narrative - a story; narrator - a person who tells a story

innate - included since birth; natal - relating to birth; natural - gotten at birth, not afterward

circumnavigate - to sail around a place; naval - relating to a navy or warships; navigate - to sail a ship through a place

necrophil - loving death; necrosis - the death of tissue due to disease or injury; necrology - a list of persons who have recently died

negate - to say it didn't happen; negative - meaning "no"; renege - to go back on a promise

neoclassic - a revival of classic form, neocolonialism - the indirect ("new") economical and political control of a region by a more powerful foreign power; neonatal - a newborn child, especially the first few weeks

nephritis - inflammation of the kidneys; nephrotomy - surgical incision of a kidney; nephron - a single, excretory unit in the kidney

neuralgia - pain along a nerve; neurologist - doctor specializing in the nerves; neurotic - mental disorder that usually does not include an impaired perception of reality

misnomer - an error in naming a person or thing; nominal - being something in name only but not in reality; nominate - to name for election or appointment, to designate

nondescript - with no special characteristics; nonfiction - true, real, not made-up; nonsense - without sense

notable - marked as worthy of attention; notarize - to certify a signature on a legal document; annotate - to add remarks

announce - to declare in public; denounce - to proclaim harsh criticism; enunciate - to speak or declare something clearly

innovate - to introduce a new way; novelty - something new; novice - a person who is new at a job; renovate - to make something like new again

enumerate - to name a number of items on a list; numerology - the study of magical uses of numbers; numerous - a large number

obstruct, oppose, object

octagon - a figure with 8 sides and 8 angles; octogenarian - person in his or her 80s; octopus - sea animal with 8 arms

binoculars - lens device for seeing distances; monocula - relating to one eye; oculist - an eye doctor

diode - an electron tube having two electrodes, a cathode and an anode; odometer - an instrument attached to a vehicle to measure the distance traversed; triode - an electron tube with an anode, a cathode, and a control grid

deodorant - a substance that helps prevent body odor; malodorous - having a terribly bad smell; odoriferous- something that bears or diffuses a scent

omnipotent - with all the power; omniscient - knowing all things; omnivorous eating all foods

optic - relating to the eyes; optician - a person who fits eyeglasses; autopsy - the examination of a dead body

optimal - the best, the most desirable; optimize - to make the best of; optimum - the best something could be

orthodontist - a dentist that straightens teeth; orthopedic - a doctor concerned with the proper alignment of the bones; orthography - the correct way of writing

osteoarthritis - inflammation caused by degeneration of the joints; osteopathy - therapy that uses among others manipulation of the skeleton to restore health; osteology - the study of bones

Outgoing - being of lively, sharing nature; outdoing - doing better than; outdoor - outside

overconfident - more confident than is appropriate; overstock - more supplies than is desirable; overexcited - ,more excited than one should be

oxymoron - combining two ideas that sharply contradict each other; oxidize - corrode a surface

paleontology - study of ancient fossils; paleography - the study of ancient forms of writing; Paleolithic - period of the Stone Age

panacea - a cure for all diseases or problems; panorama - an all-around view; pantheism - the worship of all gods; pandemic - affecting all

parallel, parameter, paramedic

parachute - protection from falling; parasol - an umbrella used to protect from the sun

paternal, patriarch, patriot

antipathy - a feeling of great dislike; apathy - a lack of feeling or interest; empathy - ability to understand another's feelings

pedal - a lever pushed by the foot; pedestrian - one who walks; pedicure - cosmetic treatment of feet and toes

compel - to force someone to act; expel - to drive someone out of a place; repel - to force back

pentagon - shape having 5 angles and 5 sides, pentagram - a five-pointed star formerly used as a symbolic figure in magic; pentathlon - an athletic contest that includes five events

dyspepsia - abnormal digestion; peptic - aiding digestion; pepsin - a digestive enzyme

permanent - lasting throughout all time; permeate - to spread throughout; persist - to continue for a long time; perennial - lasting through many years

periodontal - pertaining to bone and tissue around a tooth; peripheral - lying outside of the center; perimeter - the outer boundary of an area

esophagus - muscular tube that carries food to the stomach; anthropophagy or sarcophagy - cannibalism; xylophagous - feeding on wood

philanthropist - one who loves humanity; philology - the love of words; philosophy - the love of wisdom; bibliophil - loving books

cacophony - loud, unpleasant sounds; microphone - a device that records and amplifies sound; phonetic - relating to human speech sounds

photogenic - caused by light; photograph - image made on light-sensitive film; photon - the smallest possible unit of light

chlorophyll - a group of green pigments found in leaves; phyllotaxis - the arrangement of leaves on a stem; phyllite - a rock that forms sheets, similar to slate

physical - relating to the body; physician - a doctor; physique - nature and shape of one's body

epiphyte - a plant growing independently on the surface of another; hydrophyte - a plant that grows only in water; neophyte - a beginner, especially a person recently converted to a new belief

plastic, plaster, plasma

applaud- to show approval of especially by clapping the hands; explosion- an act of exposing something as invalid or baseless; plausible- worthy of being applauded

pneumonia - inflammation of the lungs; pneumatic - using the force of air; dyspnea - difficulty breathing

podiatrist - a doctor for the feet; podium - a small platform to stand on; tripod - a stand or frame with 3 legs

metropolis - a large city; police - people who work for the government to maintain order in a city; politics - actions of a government or political party

polychrome - with many colors; polyglot - a person fluent in many languages; polygon - shape with 3 or more straight sides

opponent - a person who places him/herself against an action, idea, etc.; postpone - to put off doing something

popular - appealing to a lot of people; population - all of the people who live in a particular area; populist - a supporter of the rights of people

export - to carry goods out of a place to another; portable - able to be carried; porter - a person who carries luggage

deposit - to place or drop something; expose to place out into the open for all to see; position - the place where someone is

posthumous - after someone's death; postpone - to delay something; postscript - an addition to an already completed document

preamble - a part in front of a formal document; prepare - to get ready in advance; prediction - a statement foretelling the future

progress, promote, project

prototype - the first of a kind; proton - on of the very basic parts of an atom; protocol - a first draft from which a document is prepared

pseudonym - a fictitious name; pseudoscience - theories presumed without proof of a scientific nature; pseudopregnancy - a false pregnancy

psyche - the human spirit or soul; psychic - relating to the human mind or someone who has supernatural mental abilities; psychology - the study of the mind

pugnacious - having a quarrelsome or aggressive nature; repugnant - distasteful, offensive or revolting; pungent - piercing

compulsion - a very strong urge; expulsion - to someone out; impulsive - having a spontaneous urge to do something

purge - remove anything undesirable; purgatory - according to Roman Catholics a place where souls must clean themselves of sin; expurgate - remove objectionable passages from a publication

computer - an electronic thinking device; dispute - to disagree with what another person thinks; input - contribution of one's thinking

pyrotechnics - the art of making fireworks; pyrometer - a thermometer for measuring high temperature; pyretic - relating to or producing fever

quadrant - open space with buildings on 4 sides; quadrennium - period of 4 years; quadruped - a 4-footed animal

quarter - one fourth; quart - a fourth of a gallon; quartet - a musical composition or group involving 4 voices or instruments

quintett - a composition for 5 voices or instruments; quintessence - pure essence, based on the ancient philosophy that there was a fifth element that was present in all things; quintuple - fivefold

eradicate - pull out at the roots; radical - fundamental, looking at things from a drastic point of view; radish - an edible root of the mustard family

radioactive - emitting radiation; radiologist - someone diagnosing or treating via radiation

ramification - the resulting consequence of a decision; ramify - to spread or branch out; ramus - a branchlike part

rebound -to spring back again; rewind - to wind something backward; reaction: a response; recognize: to identify someone or something seen before

regent - a person who rules on behalf of a king or queen; regime - a government that rules; regulate - to apply a rule

retroactive - relating to something in the past; retrogress - to go back to an earlier condition; retrospect - the remembering of past events

rhinoceros - a species of animals with a big horn on the snout; rhinoplasty - surgery of the nose; rhinovirus - viruses that are causing the common cold

rhododendron - a flower with red/pink flowers; rhodium - an element which produces a red solution; rhodopsin - a purple pigment in the retina that is needed for vision

deride - to make fun of someone; ridicule - to make fun or mock; ridiculous - silly, causing laughter

diarrhea, hemorrhage, menorrhea

ruby - deep red color and a precious stone of the same color; rubella - measles; bilirubin - reddish pigment in bile

bankrupt - unable to pay because you're "broke"; interrupt - to break into a conversation or event, to disturb; rupture - a break in something

sane - mentally healthy; sanitary - relating to cleanliness and health; sanitation - maintenance of public health and cleanliness

ascend - to climb upward; crescendo - a climbing up of the volume of music; descend - to go or climb down

conscience - sense of knowing right from wrong; conscious - knowing what is happening; omniscient - knowing everything

arteriosclerosis - hardening of the arterial walls; multiple sclerosis - disease which causes the tissue of the brain and spinal cord to harden; sclerometer - instrument for measuring hardness

microscope - a device used to see tiny things; periscope - a seeing instrument on a submarine; telescope - a device used to see over a distance

inscribe - to write letters or words on a surface; scribe - a person who writes out documents; describe - to represent with words or pictures

secede - to formally break away from; seclude - to keep away from; serum - a liquid isolated out of another

dissect - to cut apart piece by piece; intersection - the place or point where two things cross each other; bisect - to cut into two equal parts

reside- be stationed; sediment- the matter that settles to the bottom of a liquid; session- an actual or constructive sitting of a body

self-discipline - the ability to discipline yourself; self-respect - respect for yourself; selfish concerned only with your own interests

semiannual - every half year; semicircle - half a circle; semiconscious - partly conscious; semiannual - every half of a year

September - this used to be the seventh month in the Roman calendar; septet - a group of seven musicians; septuagenarian - a person in his/her seventies

conserve - to save or keep something safe; preserve - to save something; reservation - a place kept for a person

sextet or sextette - a composition or group of six, sextuple - sixfold; sexagenarian - person in his/her sixties

desolate - lonely, dismal, gloomy; solitary - done alone, by yourself; solo - a performance done by one person alone

solar - involving the sun; parasol - umbrella protecting from the sun; solarium - a room where one is exposed to sun light

insomnia - inability to fall asleep; somniloquy - talking in your sleep; somnolent - feeling sleepy

consonant - a speech sound; sonorous - producing loud, full, rich sounds; supersonic - faster than sound; unison - as one voice

philosopher - a wise person; sophisticated - wise about the ways of the world; sophism - a clever but misleading argument

circumspect - cautious, looking all around; retrospective - a looking back at past things; spectator - a person who sees an event

biosphere - the whole round surface of the earth; hemisphere - half the earth spherically shaped like a ball

inspire - to stimulate or animate; transpire - to give of vapor with waste product through the skin or a membrane; spirit - invisible life force

stable - standing steady and firm; stagnant - standing still, not moving; stationary - at a standstill, fixed

constellation - a group of stars that forms a pattern; interstellar - between the stars; stellar - relating to stars

construct - to build; destruction - the act of destroying something that was built; structure - something built; infrastructure - underlying framework of a system

submarine, subway, subordinate

sum - the combined total of everything; summation - the total, highest amount; summit the highest point or top

superior, supernatural, supervise

symmetry -similarity in size, form or arrangement; synergy - the combined effect; synchronize - to cause to occur at the same time

contact - a state in which two things touch; tactile - relating to the sense of touch; tangible - able to be touched; intact - with nothing missing

syntax - the systematic arrangement of words; taxonomy - the science of classification; ataxia - loss of the ability to coordinate muscle action

technology - the practical application of knowledge; technocracy - rule of technology; technologically - characterized by technology

telephone - a device to talk to a distant person; telescope - a device to view distant objects; television - a device to receive pictures from afar; telecommuting - working remotely, bridging the distance via virtual devices

contemporary- existing at the same time; temporal - relating to time; temporary - lasting for a limited time

continent- serving to restrain or limit; detention- the act or fact of detaining, tenacious- having parts or elements strongly adhering to each other

attrition- the act of rubbing together or wearing down; detritus- a product of disintegration or wearing away; trite- used or occurring so often as to have lost interest, freshness, or force

terminal, determine, terminate

extraterrestrial - existing outside the earth; terrain - ground or land; territory - an area of land

tetrapod - having 4 legs; tetrarchy - government by 4 rulers; tetrose - a monosaccharide with four carbon atoms

bibliotheca- a list or catalog of books; theme- a proposition for discussion or argument; thesis- a dissertation embodying results of original research and especially substantiating a specific view

monotheism - belief in one god; polytheism - worshiping more than one god; theology - the study of religion, god, etc.

thermal - relating to heat; thermos - an insulated jar that keeps heat in; thermostat - a device that controls heat

contortion - a twisted shape or position; distort - to alter the shape or condition of; retort - reply in a manner that is supposed to change the effect of something previously said

detoxification - the process of removing poisons; toxic - poisonous; toxicology - the study of poisons; intoxicated - influenced by drugs

attract - to pull objects nearer; distract - to drag attention away from something; tractor - a motor vehicle that pulls things

transcontinental - across the continent; transfer - to move from one place to another; transport - to carry something across a space

triangle, tricycle, trinity

ultrahigh - extremely high; ultramodern - more modern than anything else; ultrasonic - sound waves beyond human hearing

unabridged - not shortened; unfair - opposite of fair; unfriendly - lacking friendliness

unicycle - a vehicle with one wheel; unilateral - decided by only one person or nation; unique - the only one of its kind; unison - as one voice

suburb - residential area on the edge of a city; urban - relating to a city; urbanology - the study of city life

evacuate - to empty a dangerous place; vacant - empty, not occupied; vacation - a time without work

circumvent - to go around or bypass restrictions; convention - a gathering or assembly of people with a common interest; intervene - to come between

veracious - truthful, honest; veracity - the truth; verify - to make sure that something is true

verbalize - to put into words; adverb - a word relating to a verb; proverb - a short saying that expresses a well-known truth

reverse - to turn around; introvert - being turned towards the inside; version - a variation of an original; controversy - a conversation in which positions are turned against each other

vice president, viceroy, vice versa

evident clearly seen

convince - to win someone over; invincible - not able to be conquered; victory - the conquest of an enemy

vision - the ability to see; envision - to picture in the mind; evident - clearly visible

revival - the act of bringing back to life; vital - pertaining to live; vivacious - high-spirited and full of life

advocate - to speak in favor of; equivocate - to use misleading language that could be interpreted two different ways; vocalize - to produce with your voice

benevolent - showing good will and kindness; volition - the act of making a choice or decision, voluntary - resulting from your own free will

carnivorous, herbivorous, omnivorous

xanthine, xanthophyll, erythematoxanthine

xenophobic - afraid of foreigners; xenogenesis - the creation of offspring that is completely different from either parent; xenophile - attracted to foreigners

xerophyte - a plant that grows in dry climate; xerography - a dry photocopying process; xeric - requiring small amounts of moisture

xylocarp; xyloid- resembling wood; xylophone-an organ percussion stop of similar tone quality

zoology - study of animals; zooid - resembling an animal; zooplankton - minute floating aquatic animals

zygote - a cell formed by the union of two gametes and the organism developing from that; zygomorphic - pertaining to organisms that can be divided into symmetrical halves along one axis only