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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Decipium  \De*cip"i*um\,  n.  [NL.,  fr  L.  decipere  to  deceive.] 
  A  supposed  rare  element,  said  to  be  associated  with  cerium, 
  yttrium,  etc.,  in  the  mineral  samarskite,  and  more  recently 
  called  samarium.  Symbol  Dp  See  {Samarium}.