Thoroughpin Definition
 thûrō-pĭn, thûrə-, thŭr- 
    noun
  
 A swelling in the sheath of a tendon in a horse's hock that shows on both sides of the leg.
 Webster's New World 
Other Word Forms of Thoroughpin
Noun
Singular:
 thoroughpinPlural:
 thoroughpinsOrigin of Thoroughpin
- From its resemblance to a pin passing through the hock - From American Heritage Dictionary of the English Language, 5th Edition 
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