pra·seo·dym·i·um /ˌprezioˈdɪmiəm, ˌpresi-/
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 pra·seo·dym·i·um /ˌprezɪoˈdɪmɪəm, ˌpresɪ-/ 名詞
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 Pra·se·o·dym·i·um n.  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.

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 praseodymium
      n : 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]


 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.