from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An abnormal swelling on either side of the hock joint of horses and related animals.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An abnormal swelling (tenosynovitis) on the sides of the hock joint of horses
from the GNU version of the Collaborative International Dictionary of English
- n. A disease of the hock (sometimes of the knee) of a horse, caused by inflammation of the synovial membrane and a consequent excessive secretion of the synovial fluid; -- probably so called because there is usually an oval swelling on each side of the leg, appearing somewhat as if a pin had been thrust through.
from The Century Dictionary and Cyclopedia
- n. A swelling in the hollow of the hock of the horse, appearing on both inner and outer aspects, and caused by distention of the synovial sheath of the flexor perforans tendon playing over the side of the joint; also, a similar swelling on the posterior aspect of the carpal joint, or so-called knee of the fore leg.
From its resemblance to a pin passing through the hock.(American Heritage® Dictionary of the English Language, Fourth Edition)