■ adjective
1》 chiefly Anatomy further back in position; of or nearer the rear or hind end. The opposite of anterior .
2》 Medicine relating to or denoting presentation of a fetus in which the rear or caudal end is nearest the cervix and emerges first at birth.
3》 formal coming after in time or order; later.
■ noun humorous a person's buttocks.
Derivatives
~ity noun
~ly adverb ( Anatomy ).
Origin
C16 (as pluralnoun 'descendants'): from L., compar. of posterus 'following', from post 'after'.