Medical Terms Common Prefixes

a- or an-

without

anti-

against

auto-

self

bi-

two

brandy-

slow

dys-

bad, difficult, abnormal

epi-

over, above

eu-

good, normal

hemi-

half

hyper-

above, excessive

hypo-

less than, under

inter-

between

intra-

within

multi-

many

non-

not

peri-

around, something

poly-

many, much

post-

after, behind

pre-

before, in front

pseudo-

false

quadri-

four

semi-

half

sub-

under, below

supra-

above, over

tachy-

fast, rapid

tri-

three