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]