all prefixes - med term

a-, an-

not, without, lacking, deficient (an- before a vowel or h)

ab-

away from (a- rarely before certain consonants; abs- before c and t)

ad- (ac- before c; af- before f; ag- before g; al- before l; an-

before n; ap- before p; ar- before r; as- before s; a- before sp; at- before t)

ambi-

both

amphi-, ampho-

on both sides, around, both

ana-

up, back, against, throughout

ante-

before, forward

anti-

against, opposed to, preventing, relieving (ant- often before a vowel or h; hyphenated before I)

apo-

away from

bi- (bin-, bis-)

two, twice, double, both

cata- (cat- before a vowel or h)

downward; disordered

circum-

around

con- (co- before h; col- before l; com- before e, m, and p; cor- before r)

together, with; thoroughly, very

contra-

against, opposite

de-

down, away from, absent

di- (rarely dis-)

two, twice, double

dia- (di- before a vowel)

through, across, apart

dis- (di- before g, v, and usually before l; dif- before f )

apart, away

dys-

difficult, painful, defective, abnormal

e-, ec- (ex- before a vowel)

out of, away from

ecto- (ect- often before a vowel)

outside of

en- (em- before b, m, and p)

in, into, within

endo-, ento- (end-, ent- before a vowel)

within

epi- (ep- before a vowel or h)

upon, over, above

eso-

within, inner, inward

eu-

good, normal, healthy

ex- (e- before certain consonants; ef- before f )

out of, away from

exo-

outside, from the outside, toward the outside

extra- (rarely extro-)

on the outside, beyond

hemi-

half, partial; (often) one side of the body

heter-, hetero-

different, other, relationship to another

homo-, homeo-

same, likeness

hyper-

over, above, excessive, beyond normal

hypo- (hyp- before a vowel or h)

under, deficient, below normal

in-

(il- before l; im- before b, m, and p; ir- before r)

infra-

beneath, below

inter-

between

intra-

within (rarely intro-)

meta- (met- before a vowel or h)

change, transformation, after, behind

mono- (mon-before a vowel or h)

one, single

mult- (often multi-)

many, much, affecting many parts

non-

not

ob-

against, toward; very, thoroughly (oc- before c; op- before p)

para-

alongside, beside, abnormal, beyond (often par- before a vowel)

per- (pel- before l)

through; very, thoroughly

peri-

around, surrounding

post-

after, following, behind

pre-

before, in front of

pro-

before; forward, in front

pros-, prosth-

in place of

re-

back, again

retro-

backward, in back, behind

se-

apart, away from

semi-

half

sub- (suf- before f; sup- before p)

under

super- (often supra-)

over, above; excess

syn- (sym- before b, p, and m; sy-

n assimilates or is dropped before l and s)

trans-

across, through