a-

(an- before a vowel or h)

not, without, lacking, deficient

anti-

(ant- before a vowel or h; hyphenated before i)

against, opposed to, preventing, relieving

di-

(rarely dis-)

two-twice, double

dys-

difficult, painful, defective, abnormal

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

exo-

outside, from the outside, toward the outside

hemi-

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

hyper-

over, above, excessive, beyond normal

hypo-

(hyp- before a vowel or h)

under, deficient, below normal

mono-

(mon- before a vowel or h)

one, single

peri-

around, surrounding

syn-

(sym- before b, p, and m; the n assimilates or is dropped before s EX. systolic)

together, with, joined

amphi, ampho-

on both sides, around, both

ana-

up, back, against

apo-

away from

cata-

(cat- before a vowel or h)

downward, disordered

dia-

(di- before a vowel)

through,across, apart

eso-

within, inner, inward

eu-

good, normal, healthy

heter-, hetero-

different, other, relationship to another

homo-, homeo-

same, likeness

meta-

(met- before a vowel or h)

change, transformation, after, behind

para-

(often par- before a vowel)

 alongside, around, abnormal, beyond

pro-

before

pros-, prosth-

in place of