The Collaborative International Dictionary of English v.0.48:

Ancon \An"con\ ([a^][ng]"k[o^]m), n.; L. pl. Ancones. [L., fr.
   Gr. 'agkw`n the bent arm, elbow; any hook or bend.] (Anat.)
   The olecranon, or the elbow.
   [1913 Webster]

   Ancon sheep (Zool.), a breed of sheep with short crooked
      legs and long back. It originated in Massachusetts in
      1791; -- called also the otter breed.
      [1913 Webster] Ancon