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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Dianium  \Di*a"ni*um\,  n.  [NL.,  fr  L.  Diana;  either  as  the  name 
  of  the  Roman  goddess,  or  from  its  use  in  OE  as  a  name  of 
  silver.]  (Chem.) 
  Same  as  {Columbium}.  [Obs.]