Numerical Prefixes
Prefixes
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Prefixes
Root Words
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Words
100

deci-

decimal

tenth

100

anti-

antifreeze, antiwar

against

100

uni-

unicycle

one

100

aud

audible, auditorium

hear

100

hydr

dehydrate, hydrophobia

water

200

centi-

centimeter

hundreth

200

auto-

autobiography

self

200

bi-

bilingual

two

200

chron

chronological, synchronize

time

200

omni

omnipresent, omnivore

all, completely

300

milli-

millimeter

thousandth

300

hemi-

hemisphere

half

300

tri-

triangle, tricycle

three

300

bio

biography, biology

life

300

phobia

acrophobia, agoraphobia

fear

400

deca- or dec-

decade, decathlon

ten

400

pre-

pregame, preheat

before

400

mono-

monolingual

one

400

geo

geography, geology

of the earth

400

tele

telephone, telescope

over a long distance, far

500

cent-

century

one hundred

500

circum-

circumference, circomnavigate

in a circle, around

500
poly-

polygon

many

500

luc, lum

illuminate, translucent

light

500

spec

inspect, specimen

look

M
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