Medical Terminology (Prefixes)

Front 1

A-, an-

Back 1

Without, not, lack of

Front 2

ab-

Back 2

Away from

Front 3

ad-

Back 3

to, toward, near

Front 4

ante-

Back 4

Before, forward, in front of

Front 5

Anti-

Back 5

Against

Front 6

auto-

Back 6

Self

Front 7

Bi-

Back 7

Double, two, twice

Front 8

Brady-

Back 8

Slow

Front 9

Circum-

Back 9

Around

Front 10

Contra-

Back 10

Against, opposite

Front 11

De-

Back 11

Down, from

Front 12

Dia-

Back 12

Across, through, apart

Front 13

Dis-

Back 13

Apart, free form

Front 14

Dys-

Back 14

Bad, difficult, abnormal

Front 15

Ecto-

Back 15

Outer, outside

Front 16

En-

Back 16

In, into, within

Front 17

Endo-

Back 17

Inner, inside

Front 18

Epi-

Back 18

Over, on, upon