upper jawbone upper jaw • upper leather · · · Info · Definitions · Synonyms · Characters · · upper jawbone · · Text Common · · Latin · · Scripts 13 · · Length 4 · · Syllables Definitions · · · (noun) the jaw in vertebrates that is fused to the cranium. Synonyms: upper jaw, upper jawbone, maxilla, maxillary. · · Noun Definition 1 Synonyms · · · upper jaw · · Synonym 1 maxilla · · Synonym 2 maxillary · · Synonym 3 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 j latin small letter j U+006A n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 u latin small letter u U+0075 w latin small letter w U+0077