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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  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}.