thorough-pin

thoroughpin

[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.

Origin:
1780–90; thorough + pin

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World English Dictionary
thoroughpin (ˈθʌrəˌpɪn)
 
n
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]

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