Prefixes in Medical Terminology

a-

without

an-

without

anti-

against

auto-

self

brady-

slow

de-

without

dys-

painful, difficult

endo-

within; inner

epi-

above

eu-

normal

ex-

outward

extra-

outside of

hetero-

different

homo-

same

hyper-

excessive

hypo-

below

in-

not; inward

inter-

between

intra-

within

macro-

large

mirco-

small

neo-

new

para-

beside; abnormal

per-

through

peri-

around

post-

after

pre-

before

pro-

before

pseudo-

false

re-

again

retro-

backwards/behind

sub-

under

tachy-

fast

trans-

across

ultra-

beyond

un-

not

bi-

2

hemi-

half

mono-

1

multi-

many

nulli

none

pan-

all

poly-

many

quadri-

4

semi-

partial

tetra-

4

tri-

3