buttocks

Definitions of buttocks
  1. noun
    the fleshy part of the human body that you sit on
    synonyms: ass, backside, behind, bottom, bum, buns, butt, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush
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    type of:
    body part
    any part of an organism such as an organ or extremity
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