podarthrum

from The Collaborative International Dictionary of English v.0.48

Podarthrum \Po*dar"thrum\, n.; pl. {Podarthra}. [NL., fr. Gr. ?,
   ?, foot + ? joint.] (Anat.)
   The foot joint; in birds, the joint between the metatarsus
   and the toes.
   [1913 Webster]