platinum platinous • platinum ammine · · · Info · Definitions · Synonyms · Characters · · platinum · · Text Latin · · Script 8 · · Length 3 · · Syllables Definitions · · · (noun) a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits. Synonyms: Pt, atomic number 78. · · Noun Definition 1 Synonyms · · · pt · · Synonym 1 atomic number 78 · · Synonym 2 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E p latin small letter p U+0070 t latin small letter t U+0074 u latin small letter u U+0075