optical crown glass optical crown • optical density · · · Info · Definitions · Synonyms · Characters · · optical crown glass · · Text Common · · Latin · · Scripts 19 · · Length 5 · · Syllables Definitions · · · (noun) optical glass of low dispersion and low refractive index. Synonyms: optical crown, crown glass, optical crown glass. · · Noun Definition 1 Synonyms · · · optical crown · · Synonym 1 crown glass · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 g latin small letter g U+0067 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 w latin small letter w U+0077