- human anatomy denoting the back surface of the body. Often used to indicate the position of one structure relative to another, nearer the back of the body.
- After, in relation to time or space.
- veterinary anatomy limited to structures of the eye and ear. The word is otherwise ambiguous with respect to the anatomy of quadrupeds; caudal is preferred.
[L. comparative of posterus, following]
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Examples: glitazone, GI cocktail, etc.