knuckleboneWiktionary 原文构词拆分knuckle词根/词干+bone词根/词干词源说明From knuckle + bone.释义（英文）名词 NounA 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.(slang) A die.