Source : Webster's Revised Unabridged Dictionary (1913)

Unciform \Un"ci*form\, a. [L. uncus a hook + -form.]
   Having the shape of a hook; being of a curved or hooked from;
   hooklike.

   {Unciform bone} (Anat.), a bone of the carpus at the bases of
      the fourth and fifth metacarpals; the hamatum.

Source : WordNet®

unciform bone
     n : the wrist bone in line with the 4th and 5th fingers [syn: {hamate},
          {hamate bone}, {os hamatum}]