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Meaning of knucklebone

knuck•le•bone

Pronunciation: (nuk'ul-bōn"), [key]
— n.
  1. (in humans) any of the bones forming a knuckle of a finger.
  2. (in quadrupeds) a bone homologous with a wrist, ankle, or finger bone of humans, or its knobbed end.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.