Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. (Zo["o]l.) The umbones of a bivalve shell.

Source : WordNet®

nates
     n : 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}, {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}]