posterior
pos-te-ri-or
adjective
Situated at the back or behind, especially in the body.
"The posterior wall of the heart."
noun
The back part of a human or animal body; the buttocks.
"He landed on his posterior."
Thesaurus
Synonyms: back tooth, behind, fanny, prat, bottom, rump, tail, butt, stern, ass, tush, arse
Antonyms: anterior