spavin, spaveyne

[O. Fr. esparvain; Fr. éparvin; Sp.esparavan; Port. esparavão; O. Ital. spavano; Italian spavenio.] A disease in horses, affecting the hock-joint, or joint of the hind-leg, between the knee and the fetlock. There are two forms of the disease: (1) Bog-spavin, or blood spavin, in which the joint is distended by synovia, or joint-oil; (2) Bone-spavin, or spavin proper, in which there is a morbid deposition of bony substance, such as to unite separate bones. "Lastly, the connection between the blood spar in and the thoroughpin is proved by pre ing on the swelling in front, and thereby causing the enlargements above to increase in size."-- Field , April 4, 1885.