enlargement of the hock of a horse by a bony growth (bony spavin) or fluid accumulation in the joint (bog spavin), usually caused by inflammation or injury, and often resulting in lameness
Word origin
C15: from Old French espavin, of unknown origin
spavin in American English
(ˈspævɪn)
noun
a disease of horses in which a deposit of bone (bone spavin) or an infusion of lymph (bog spavin) develops in the hock joint, usually causing lameness