knucklebone
noun
knuck·le·bone ˈnək-əl-ˌbōn 
1
: a bone (such as a metatarsus or metacarpus of a sheep) used in games and formerly in divination
2
knucklebones plural in form but singular in construction : a game played with knucklebones or jacks
Example Sentences
Recent Examples on the Web To win, players raced their opponent to the opposite end of the board, moving pieces according to knucklebone dice rolls. 
Meilan Solly, Smithsonian Magazine, 6 Feb. 2020 As a onetime priest, McLaughlin would have undoubtedly understood the desire to possess a relic from a venerated figure, like a saint’s knucklebone or a sliver of the true cross. John Kelly, Washington Post, 4 June 2018
Meilan Solly, Smithsonian Magazine, 6 Feb. 2020 As a onetime priest, McLaughlin would have undoubtedly understood the desire to possess a relic from a venerated figure, like a saint’s knucklebone or a sliver of the true cross. John Kelly, Washington Post, 4 June 2018 Word History
First Known Use
1577, in the meaning defined at sense 1