"posterior" in the noun sense
1. buttocks, nates, arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass
the fleshy part of the human body that you sit on
"he deserves a good kick in the butt"
"are you going to sit on your fanny and do nothing?"
2. back tooth, posterior
a tooth situated at the back of the mouth
"posterior" in the adjective sense
1. posterior
located at or near or behind a part or near the end of a structure
2. later, ulterior, posterior
coming at a subsequent time or stage
"without ulterior argument"
"the mood posterior to"
Source: WordNet® (An amazing lexical database of English)
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