maxillary maxillar • maxilliferous · · · Info · Definitions · Synonyms · Characters · · maxillary · · Text Latin · · Script 9 · · Length Definitions · · · (noun) the jaw in vertebrates that is fused to the cranium. Synonyms: upper jaw, upper jawbone, maxilla. · · Noun Definition 1 (adj) of or relating to the upper jaw. · · Adjective Definition 1 Synonyms · · · upper jaw · · Synonym 1 upper jawbone · · Synonym 2 maxilla · · Synonym 3 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D r latin small letter r U+0072 x latin small letter x U+0078 y latin small letter y U+0079