Mōl'yb-dē'num, n.

n. [N. Lat. molybdænum, Fr. molybdène. See MOLYBDENA.] (Chem.) A rare metal occurring in nature, sometimes as a sulphide, sometimes as molybdic acid, and at others with lead, as molybdate of lead. It is obtained only in small, separate globules, in a blackish, brilliant mass. These are brittle, and extremely infusible.