<p><strong>Noun:</strong></p><ul><li>A disease of the hock joint of horses in which enlargement occurs because of collected fluids:<ul><li>Bog spavin</li><li>Bony growth (bone spavin)</li><li>Distention of the veins (blood spavin)</li></ul></li><li>An excrescence or enlargement so formed.</li></ul>