Didymium

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Didymium \Di*dym"i*um\, n. [NL., fr. Gr. ? twin.] (Chem.)
     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}.


     [1913 Webster]