WordReference Random House Unabridged Dictionary of American English © 2026
thor•ough•pin
(thûr′ō pin′, -ə pin′, thur′-),USA pronunciation n. [Vet. Pathol.]
- Veterinary Diseasesan abnormal swelling just above the hock of a horse, usually appearing on both sides of the leg and sometimes causing lameness.
- thorough + pin 1780–90