manganese tetroxide manganese steel • manganese velvet brown · · · Info · Definitions · Synonyms · Characters · · manganese tetroxide · · Text Common · · Latin · · Scripts 19 · · Length Definitions · · · (noun) an oxide of manganese found naturally as hausmannite. · · Noun Definition 1 Synonyms · · · manganese · · Synonym 1 mn · · Synonym 2 atomic number 25 · · Synonym 3 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 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 s latin small letter s U+0073 t latin small letter t U+0074 x latin small letter x U+0078