optical glass optical fusion • optical illusion · · · Info · Definitions · Characters · · optical glass · · Text Common · · Latin · · Scripts 13 · · Length 4 · · Syllables Definitions · · · (noun) clear homogeneous glass of known refractive index; used to make lenses. Synonyms: optical glass. · · Noun Definition 1 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 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