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From Biology-Online Dictionary | Biology-Online Dictionary
(1) Situated behind or toward the rear of.
(2) Near or toward the caudal end of an animal, especially quadruped.
(3) Toward the dorsal or back plane of the human body.
(4) Toward the tail or caudal end of an embryo.
Word origin: Latin posterior, comparative of posterus (coming after).
Related forms: posteriorly (adverb)