knucklebone

The English word “knucklebone” has 3 meanings listed here.

noun

A bone that forms a knuckle in the human hand, in an animal's paw or any bone that forms a similar bump.
Such a bone once used in knucklebones and other children's games of chance.
A die.

From knuckle + bone.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.