fundament

fundament
    n 1: the fundamental assumptions from which something is begun
         or developed or calculated or explained; "the whole
         argument rested on a basis of conjecture" [syn: {basis},
         {base}, {foundation}, {fundament}, {groundwork},
         {cornerstone}]
    2: 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}]
    3: lowest support of a structure; "it was built on a base of
       solid rock"; "he stood at the foot of the tower" [syn:
       {foundation}, {base}, {fundament}, {foot}, {groundwork},
       {substructure}, {understructure}]
    

Fundament \Fun"da*ment\, n. [OE. fundament, fundement,
   fondement, OF. fundement, fondement, F. fondement, fr. L.
   fundamentum foundation, fr. fundare to lay the bottom, to
   found, fr. fundus bottom. See {Fund}.]
   1. Foundation. [Obs.] --Chaucer.
      [1913 Webster]

   2. The part of the body on which one sits; the buttocks;
      specifically (Anat.), the anus. --Hume.
      [1913 Webster]
    

61 Moby Thesaurus words for "fundament":
      backside, base, basement, basis, beam, bearing wall, bed, bedding,
      bedrock, behind, belly, bottom, bottom side, breech, buttocks,
      derriere, downside, floor, flooring, fond, footing, foundation,
      fundamental, ground, grounds, groundwork, hardpan, lower side,
      lowest layer, lowest level, nether side, nethermost level,
      pavement, posterior, principle, radical, rear, riprap, rock bottom,
      rudiment, rump, seat, sill, solid ground, solid rock, stereobate,
      stylobate, substratum, substruction, substructure, terra firma,
      underbelly, underbuilding, undercarriage, undergirding, underlayer,
      underneath, underpinning, underside, understruction,
      understructure