Unit 1 Prefixes

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, usually derived from Latin)

out of, away from

ecto- (ect- 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 (location wise)

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 vowel or h)

under, deficient, below normal

mono- (mon- before vowel or h)

one, single

peri-

around, surrounding

syn- (sym- before b, p, m; the n assimilates or is dropped before s)

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, discordered

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 (location wise)

pro-

before

pros, prosth-

in place of