Greek Roots

aqua

water (aquatic, aquarium)

astro

star (astronomy, astronaut)

aud

hear (audible, auditorium)

bene

good (benefit, benevolent)

bio

life (biology, biography)

chrono

time (chronology, synchronize)

circum

around (circumference, circumstance)

cred

believe (credible, incredible)

dict

say/speak (dictate, prediction)

duc/duct

lead (conduct, educate)

geo

earth (geography, geology)

graph

write (autograph, telegraph)

hydro

water (hydration, hydroelectric)

junct

join (conjunction, junction)

log

word/study (biology, logic)

lum/luc

light (illuminate, lucid)

magn

great/large (magnitude, magnificent)

manu

hand (manual, manuscript)

micro

small (microscope, microbiology)

mit/miss

send (transmit, mission)

mort

death (mortal, mortician)

multi

many (multitude, multimedia)

ped/pod

foot (pedal, tripod)

phil

love (philosophy, bibliophile)

phon

sound (telephone, symphony)

photo

light (photography, photosynthesis)

port

carry (transport, portable)

scrib/script

write (describe, manuscript)

sect

cut (section, dissect)

semi

half/part (semicircle, semicolon)

spect

see/look (inspect, spectator)

struct

build (construct, structure)

tele

far (telephone, telescope)

temp

time (temporary, contemporary)

terra

earth/land (terrain, territory)

vid/vis

see (video, visual)

voc

voice/call (vocal, advocate)

ante

before (antecedent, antechamber)

anti

against (antibiotic, antidote)

auto

self (autobiography, automatic)

circ

around (circle, circulate)

co/con/com

with/together (cooperate, connect, combine)

contra/counter

against (contradict, counteract)

de

down/away (descend, detach)

dis

not/opposite (disagree, disable)

ex

out/from (exit, exhale)

in/il/im/ir

not (inactive, illegal, impossible, irregular)

inter

between (international, intercept)

mal

bad (malfunction, malice)

mis

wrong (misunderstand, mistake)

mono

one (monopoly, monologue)

multi/poly

many (polygon, polygraph)

non

not (nonsense, nonstop)

post

after (postpone, postscript)

pre

before (preview, predict)

pro

forward/for (proceed, promote)

re

again/back (review, return)

sub

under (submarine, subway)

super

above/beyond (superhuman, supernatural)

trans

across (transport, transfer)

tri

three (triangle, tripod)

uni

one (universe, unicycle)

ambi/amphi

both (ambidextrous, amphibian)

cap/capt

take/seize (capture, capacity)

cide

kill (homicide, pesticide)

clin

lean/bend (incline, decline)

clos/clud

shut/close (exclude, conclude)

cor/cour

heart (courage, cordial)

derm

skin (dermatology, hypodermic)

dom

master/home (dominate, domestic)

dyn

power (dynamic, dynasty)

equ

equal (equation, equity)

fid

faith/trust (confide, fidelity)

flamm

fire (flammable, inflammation)

form

shape (transform, uniform)

frag/fract

break (fragment, fracture)

gen

birth/origin (generation, genetics)

grad/gress

step/go (progress, gradual)

hemi

half (hemisphere)

homo

same (homogeneous, homonym)

jur/jus

law (jury, justice)

lab

work (labor, collaborate)

lith

stone (monolith, lithography)

loc

place (location, relocate)

mater/matr

mother (maternity, matriarch)

metr/meter

measure (thermometer, perimeter)

nav/naut

ship/sailor (navigate, astronaut)

nom

name/law (nominate, astronomy)

ocu

eye (ocular, binoculars)

ortho

straight/correct (orthodox, orthodontist)

path

feeling/disease (sympathy, pathology)

ped

child (pediatric, pedagogy)

pel/puls

drive/push (propel, repulse)

pend

hang/weigh (pendulum, suspend)

rupt

break (interrupt, rupture)

san

health (sanitary, sane)

sign

mark (signal, signature)

sol

sun (solar, parasol)

somn

sleep (insomnia, somnolent)

tact/tang

touch (contact, tangible)