Etymology
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fetlock (n.)

"tuft of hair behind the pastern-joint of a horse," early 14c., fetlak, from a Germanic source (cognates: Dutch vetlock, Middle High German fizlach, German Fiszloch), perhaps from Proto-Germanic *fetel- (source of German fessel "pastern"), from PIE *ped-el-, from root *ped- "foot." The Middle English diminutive suffix -ok (from Old English -oc) was misread and the word taken in folk etymology as a compound of feet and lock (of hair).

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Definitions of fetlock

fetlock (n.)
the joint between the cannon bone and the pastern;
Synonyms: fetlock joint
fetlock (n.)
projection behind and above a horse's hoof;
From wordnet.princeton.edu