The New International Encyclopædia/Spavin, Bog
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SPAVIN, Bog (OF. esparvain, esparvent, Fr. éparvin, spavin; possibly from Goth, sparwa, OHG. sparo, sparwe, AS. spearwa, spearewa, Eng. sparrow; in allusion to the hopping gait of a spavined animal). A lesion of the true hock-joint of the horse, consisting in distention of the capsule inclosing the joint. It usually arises suddenly from a sprain in action, from overwork, or wounds.