1. 
   Thorough Pin
   Swelling in the web of the hock that may be an unsoundness or a blemish
   Found op http://www.gaitedhorses.net/Articles/HorseGlossary.html
   
   
2. 
   thorough-pin
   <veterinary> 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. ... This is probably so called because there is synovial distention of the sheath of the flexor perforans tendon pr...
   Found op http://www.mondofacto.com/facts/dictionary?thorough-pin
   
   
3. 
   Thoroughpin
   Thor'ough·pin` noun (Far.) 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 s...
   Found op http://www.encyclo.co.uk/webster/T/47
   
   
4. 
   Thoroughpin
   • (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 ha...
   Found op http://thinkexist.com/dictionary/meaning/thoroughpin/
   
   
5. 
   THOROUGHPIN
   Stress on the deep digital flexor tendon, with puffiness in the web of the hock.
   Found op http://www.thehorse.com/Glossary.xhtml?L=T
   
   

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