molybdenum molybdenous • molybdenum steel · · · Info · Definitions · Synonyms · Characters · · molybdenum · · Text Latin · · Script 10 · · Length 4 · · Syllables Definitions · · · (noun) a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel. Synonyms: Mo, atomic number 42. · · Noun Definition 1 Synonyms · · · mo · · Synonym 1 atomic number 42 · · Synonym 2 Characters · · b latin small letter b U+0062 d latin small letter d U+0064 e latin small letter e U+0065 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F u latin small letter u U+0075 y latin small letter y U+0079