cadmiumEnglishOxford New American Dictionarycadmium /ˈkadmēəm, ˈkædmiəm / ▸ noun the chemical element of atomic number 48, a silvery-white metal. (Symbol: Cd) – ORIGIN early 19th century : from Latin cadmia ‘calamine’, so named because it is found with calamine in zinc ore. Compare with calamine.