Webster's English Dictionary

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fetlock

fet.lock \'fet-.la:k\ n [ME fitlok, fetlak; akin to OE fo-t foot] 1a: a 
   projection bearing a tuft of hair on the back of the leg above the ho of of 
   a horse or similar animal 1b: the tuft of hair itself  2: the joint of the 
   limb at the fetlock