Common Prefixes in Medical Terminology

Front

a-, an-

Back

without, not

Front

ab-

Back

away from

Front

ad-

Back

toward

Front

ana-

Back

up, back, again

Front

ante-

Back

before

Front

anti-

Back

against

Front

auto-

Back

self

Front

brachy-

Back

short

Front

brady-

Back

slow

Front

circum-

Back

around