mo ‧ lyb ‧ de ‧ num /məˈlɪbdənəm/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: Modern Latin ; Origin: Greek molybdaina , from molybdos 'lead' ]
a hard silver-white metal that is used to make steel stronger. It is a chemical ↑ element : symbol Mo