buttocks

from WordNet (r) 3.0 (2006)
buttocks
    n 1: 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?" [syn: {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}]
from The Collaborative International Dictionary of English v.0.48
buttocks \but"tocks\ n. pl.
   the fleshy part of the human body at the back of the hip, on
   which a person sits.

   Syn: 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.
        [WordNet 1.5]
from Moby Thesaurus II by Grady Ward, 1.0
37 Moby Thesaurus words for "buttocks":
      arse, ass, backside, beam, behind, bottom, breech, bum, butt, can,
      cheeks, croup, crupper, derriere, duff, fanny, fundament, haunches,
      heinie, hind end, hinder, hindquarters, keister, nates, posterior,
      prat, rear, rear end, rump, seat, secretiveness, stem, tail,
      tail end, tuchis, tush, tushy
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