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The Collaborative International Dictionary
Hypotarsus

Hypotarsus \Hy`po*tar"sus\, n.; pl. Hypotarsi. [NL. See Hypo-, and Tarsus.] (Anat.) A process on the posterior side of the tarsometatarsus of many birds; the calcaneal process. -- Hy`po*tar"sal, a.

Wiktionary
hypotarsus

n. (context anatomy English) A process on the posterior side of the tarsometatarsus of many birds; the calcaneal process.