Source : Webster's Revised Unabridged Dictionary (1913)

Triquetral \Tri*que"tral\, a.
   Triquetrous.

Source : WordNet®

triquetral
     n : a wrist bone that articulates with the pisiform and hamate
         and lunate bones [syn: {triquetral bone}, {os triquetrum},
          {cuneiform bone}, {pyramidal bone}]