atomic number 77 atomic number 76 • atomic number 78 · · · Info · Definitions · Synonyms · Characters · · atomic number 77 · · Text Common · · Latin · · Scripts 16 · · Length 10 · · Syllables Definitions · · · (noun) a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium. Synonyms: iridium, Ir, atomic number 77. · · Noun Definition 1 Synonyms · · · iridium · · Synonym 1 ir · · Synonym 2 Characters · · space U+0020 7 digit seven U+0037 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 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 r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075