The Collaborative International Dictionary of English v.0.48:

Tarsometatarsus \Tar`so*met`a*tar"sus\, n.; pl.
   Tarsometatarsi. [NL.] (Anat.)
   The large bone next the foot in the leg of a bird. It is
   formed by the union of the distal part of the tarsus with the
   metatarsus.
   [1913 Webster]