DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   atomic number 59
       n 1: a soft yellowish-white trivalent metallic element of the
            rare earth group; can be recovered from bastnasite or
            monazite by an ion-exchange process [syn: praseodymium,
            Pr, atomic number 59]