knucklebones knucklebone • knuckled · · · Info · Definitions · Synonyms · Characters · · knucklebones · · Text Latin · · Script 12 · · Length 4 · · Syllables Definitions · · · (noun) a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball. Synonyms: jacks, jackstones. · · Noun Definition 1 Synonyms · · · jacks · · Synonym 1 jackstones · · Synonym 2 Characters · · b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 k latin small letter k U+006B l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 u latin small letter u U+0075