ethmoid sinus ethmoiditis • ethmolachrymal · · · Info · Definitions · Synonyms · Characters · · ethmoid sinus · · Text Common · · Latin · · Scripts 13 · · Length 4 · · Syllables Definitions · · · (noun) a sinus of the meatuses of the nasal cavity (behind the bridge of the nose). Synonyms: ethmoid sinus, ethmoidal sinus, sinus ethmoidales. · · Noun Definition 1 Synonyms · · · ethmoidal sinus · · Synonym 1 sinus ethmoidales · · Synonym 2 Characters · · space U+0020 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075