- a silver-white metallic element, used as an alloy with iron in making hard, high-speed cutting tools.Symbol: Mo; atomic weight: 95.94; atomic number: 42; specific gravity: 10.2.
- a very hard ductile silvery-white metallic element occurring principally in molybdenite: used mainly in alloys, esp to harden and strengthen steels. Symbol: Mo; atomic no: 42; atomic wt: 95.94; valency: 2–6; relative density: 10.22; melting pt: 2623°C; boiling pt: 4639°C
