Spavin /(?)/

Spav·in

Spavin

n.
  1. A disease of horses characterized by a bony swelling developed on the hock as the result of inflammation of the bones; also, the swelling itself. The resulting lameness is due to the inflammation, and not the bony tumor as popularly supposed. (Far.)

Phrases & Compounds
Bog spavin
a soft swelling produced by distention of the capsular ligament of the hock; -- called also blood spavin.
Bone spavin
spavin attended with exostosis; ordinary spavin.