Medical Terminology Prefixes

a-

no, not, without

ab-

away from (the b faces away from the a)

ad-

toward (the d faces toward the a)

an-

no, not, without

ana-

up

ante-

before, forward

anti-

against

aut-, auto-

self, own

bi-

two

-brady

slow

cata-

down

con-

with, together

contra-

against, opposite

de-

down, lack of

dia-

through, complete

dys-

bad, painful, difficult, abnormal

ec-, ecto-

out, outside

en-, end-, endo-

within

epi-

above, upon

eu-

good, normal

ex-

out, outside of, outward, away from

exo-

out, outside of, outward

hemi-

half

hyper-

excessive, above, more than normal

hypo-

deficient, below, under, less than normal

in-

into, in; not

infra-

beneath, under

inter-

between

intra-

in, within, into

macro-

large

mal-

bad

meta-

change, beyond

micro-

small

neo-

new

pan-

all

para-

abnormal, beside, near

per-

through

peri-

surrounding, around

poly-

many, much

post-

after, behind

pre-

before, in front of

pro-

before, forward

pros-

before, forward

pseudo-

false

re-

back, backward, again

retro-

behind

sub-

below, under

supra-

above, upper

syn-, sym-

together, with

tachy-

fast

trans-

across, through

ultra-

beyond, excess

uni-

one