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3 definitions found
 for praseodymium
From The Collaborative International Dictionary of English v.0.48 :

  Praseodymium \Pra`se*o*dym"i*um\, n. [Praseo- + didymium.]
     An elementary substance, one of the constituents of didymium;
     -- so called from the green color of its salts. Symbol Ps.
     Atomic weight 143.6.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

      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]

From The Elements (07Nov00) :

  Symbol: Pr
  Atomic number: 59
  Atomic weight: 140.907
  Soft silvery metallic element, belongs to the lanthanoids. Only natural
  isotope is Pr-141 which is not radioactive.  Fourteen radioactive
  have been artificially produced. Used in rare-earth alloys. Discovered
  1885 by C.A. von Welsbach.

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