Category:Didymium

Di*dym"i*um, n. Etym: [NL., fr. Gr. (Chem.)

Defn: A rare metallic substance usually associated with the metal cerium; -- hence its name. It was formerly supposed to be an element, but has since been found to consist of two simpler elementary substances, neodymium and praseodymium. See Neodymium, and Praseodymium.