From The Collaborative International Dictionary of English v.0.44 [gcide]:
Praseodymium \Pra'se*o*dym"i*um\, noun [Praseo- + didymium.] (Chem.) An elementary substance, one of the constituents of didymium; -- so called from the green color of its salts. Symbol Ps. Atomic weight 143.6.
From WordNet (r) 2.0 [wn]:
noun
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: {Pr}, {atomic number 59}]
From Elements database 20001107 [elements]:
praseodymium 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 isotopes have been artificially produced. Used in rare-earth alloys. Discovered in 1885 by C.A. von Welsbach.
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