knucklebone

[ nuhk-uh l-bohn ]
/ ˈnʌk əlˌboʊn /

noun

(in humans) any of the bones forming a knuckle of a finger.
(in quadrupeds) a bone homologous with a wrist, ankle, or finger bone of humans, or its knobbed end.

Origin of knucklebone

late Middle English word dating back to 1400–50; see origin at knuckle, bone
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for knucklebones (1 of 2)

knucklebones

/ (ˈnʌkəlˌbəʊnz) /

noun

(functioning as singular) a less common name for jacks

British Dictionary definitions for knucklebones (2 of 2)

knucklebone

/ (ˈnʌkəlˌbəʊn) /

noun

any bone forming part of a knuckle or knuckle joint
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for knucklebones

knucklebone

[ nŭkəl-bōn′ ]

n.

A knobbed bone, as of a knuckle or joint.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.