optic chiasm optic axis • optic chiasma · · · Info · Definitions · Synonyms · Characters · · optic chiasm · · Text Common · · Latin · · Scripts 12 · · Length 5 · · Syllables Definitions · · · (noun) the crossing of the optic nerves from the two eyes at the base of the brain. Synonyms: optic chiasma, optic chiasm, chiasma opticum. · · Noun Definition 1 Synonyms · · · optic chiasma · · Synonym 1 chiasma opticum · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D o latin small letter o U+006F p latin small letter p U+0070 s latin small letter s U+0073 t latin small letter t U+0074