The Collaborative International Dictionary of English v.0.48:

Mesocuneiform \Mes`o*cu*ne"i*form\, Mesocuniform
\Mes`o*cu"ni*form\, n. [Meso- + cuneiform, cuniform.] (Anat.)
   One of the bones of the tarsus. See 2d Cuneiform.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cuneiform \Cu*ne"i*form\, Cuniform \Cu"ni*form\, n.
   1. The wedge-shaped characters used in ancient Persian and
      Assyrian inscriptions. --I. Taylor (The Alphabet).
      [1913 Webster]

   2. (Anat.)
      (a) One of the three tarsal bones supporting the first,
          second third metatarsals. They are usually designated
          as external, middle, and internal, or ectocuniform,
          mesocuniform, and entocuniform, respectively.
      (b) One of the carpal bones usually articulating with the
          ulna; -- called also pyramidal and ulnare.
          [1913 Webster]