Medical Prefixes

a-

without/not

af-

toward

an-

without/not

ante-

before

anti-

against/resisting

auto-

self

bi-

two/double

circum-

around

co-/con-

with/together

contra-

against

de-

down from/undoing

dia-

across/through

dipl-

twofold/double

dys-

bad/disordered/difficult

ectop-

displaced

ef-

away from

em-/en-

in/into

endo-

within

epi-

upon

ex-/exo-

out of/out from

extra-

outside of

eu-

good

hapl-

single

hem-/hemat-

blood

hemi-

half

hom(e)o-

same/equal

hyper-

over/above

hypo-

under/below

infra-

below/beneath

inter-

between

intra-

within

iso-

same/equal

macro-

large

mega-

large/million(th)

mes-

middle

meta-

beyond/after

micro-

small/millionth

milli-

thousandth

mono-

one/single

neo-

new

non-

not

oligo-

few/scanty

ortho-

straight/correct/normal

para-

by the side of/near

per-

through

peri-

arround/surrounding

poly-

many

post-

after

pre-

before

pro-

first/promoting

quadr-

four

re-

back again

retro-

behind

semi-

half

sub-

under

super-/supra-

over/above/excessive

trans-

across/through

tri-

three/triple