In equestrian and veterinary terminology, the stifle joint in the hind leg of a horse or other quadruped.
From French 'grasset' (the knee of a horse); borrowed into English from French equestrian vocabulary.
Horse anatomy has its own vocabulary because horsemen needed precise terms—'grasset' is how farriers and vets refer to the stifle, a joint that works like our knee but is actually quite different biomechanically.
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