pin bone pinbone • pin borer · · · Info · Definitions · Characters · · pin bone · · Text Common · · Latin · · Scripts 8 · · Length 2 · · Syllables Definitions · · · (noun) part of the sirloin between the flat bone and the porterhouse. Synonyms: pin bone. · · Noun Definition 1 Characters · · space U+0020 b latin small letter b U+0062 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070