Etymology
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buttocks (n.)

"the two protuberances which form the rump in men and animals," c. 1300, probably from Old English buttuc "end, short piece of land," from Proto-Germanic *butaz, from PIE root *bhau- "to strike," thus related to butt (n.1).

updated on September 12, 2017

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Definitions of buttocks from WordNet

buttocks (n.)
the fleshy part of the human body that you sit on;
Synonyms: 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
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.