Medical Prefixes

a, an-

without

ab-

away from

acro-

extremities (hands or feet)

ad-

toward

alb-

white

aero-

air

ambi-

both or both sides

aniso-

unequal

ante-

before

anti-

against

apo-

seperation

append-

appendic

astro-

star

auto-

self

bi-

two (double)

bio-

life

bracy-

short

brady-

slow

cac-

bad

cata-

down, lower

centi-

one hundred

circum-

around

con-

with, together

contra-

opposition, against

de-

take away from, remove

deca-

ten

dia-

through

dys-

bad, painful, difficult

ecto, exo-

outside

echo-

repetition

ego-

self interest

endo-

within

epi-

upon, over

eu-

good, easy

extra-

outside

gyne-

woman

hemi-

one side, half

hemo-

blood

histero-

tissue

homo-

similar, same

hydro-

water

hyper-

above normal, excessive, beyond

hypo-

under, below normal

in-

in, into

infra-

below, under

intra-

within

ipsi- (iso)

same

iso-

equal, same

kilo-

thousand

mal-

bad, poor

megalo-

large (enlarged)

meno-

meses (mestruation)

meso-

middle, pertaining to mesentery

meta-

after, beyond, over, change or transformation, following in a series

milli-

one thousandth, mono, one

multi-

many (more than one)

noct-

night

nulli-

none

nyct-

night

olig-

little, scanty

pan-

all, every

para-

beside, near

per-

through

peri-

around or about

poly-

many, much

post-

following, after

pre-

before

primi-

first

pro-

preceding, coming before

pyo-

pus

pyro-

fire

quadri-

four

quint-

five

re-

put back

retro-

behind, backward

semi-

one side, half

sept-

seven

sext-

six

sta-

slowed, halted, controlled

sub-

under, near

supra-

above, beyond

syn-

going together, united

tachy-

fast

tel-

end, far away

trans-

across, through

tri-

three

ultra-

beyond

uni

one (mono)