[thur-oh-pin, -uh-pin, thuhr-]
noun Veterinary Pathology.
an abnormal swelling just above the hock of a horse, usually appearing on both sides of the leg and sometimes causing lameness.

1780–90; thorough + pin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thoroughpin (ˈθʌrəˌpɪn)
an inflammation and swelling on both sides of the hock joint of a horse affecting the sheath of the deep flexor tendon
[C18: so called because it makes the leg look as if it has a pin stuck through it]

Collins English Dictionary - Complete & Unabridged 10th Edition
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