nates

from WordNet (r) 3.0 (2006)

nates
    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

Nates \Na"tes\, n. pl. [L., the buttocks.]
   1. (Anat.)
      (a) The buttocks.
      (b) The two anterior of the four lobes on the dorsal side
          of the midbrain of most mammals; the anterior optic
          lobes.
          [1913 Webster]

   2. (Zool.) The umbones of a bivalve shell.
      [1913 Webster]