maxillary sinus maxillary artery • maxillary vein · · · Info · Definitions · Characters · · maxillary sinus · · Text Common · · Latin · · Scripts 15 · · Length 6 · · Syllables Definitions · · · (noun) one of a pair of sinuses forming a cavity in the maxilla. Synonyms: maxillary sinus. · · Noun Definition 1 Characters · · space U+0020 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 n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075 x latin small letter x U+0078 y latin small letter y U+0079