ethmoid bone ethmoidal vein • ethmoiditis · · · Info · Definitions · Synonyms · Characters · · ethmoid bone · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) one of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity. Synonyms: ethmoid, ethmoid bone. · · Noun Definition 1 Synonyms · · · ethmoid · · Synonym 1 Characters · · space U+0020 b latin small letter b U+0062 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 t latin small letter t U+0074