The Collaborative International Dictionary of English v.0.48:

Talus \Ta"lus\, n.; pl. Tali. [L., the ankle, the ankle bone.]
   1. (Anat.) The astragalus.
      [1913 Webster]

   2. (Surg.) A variety of clubfoot (Talipes calcaneus). See
      the Note under Talipes.
      [1913 Webster]