Praseodymium

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The American Heritage® Dictionary of the English Language, 4th Edition
  • n. A soft, silvery, malleable, ductile rare-earth element that develops a characteristic green tarnish in air. It occurs naturally with other rare earths in monazite and is used to color glass and ceramics yellow, as a core material for carbon arcs, and in metallic alloys. Atomic number 59; atomic weight 140.908; melting point 935°C; boiling point 3,127°C; specific gravity 6.8; valence 3, 4. See Table at element.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. A metallic chemical element (symbol Pr) with an atomic number of 59.
    • the GNU version of the Collaborative International Dictionary of English
  • n. An elementary substance, one of the constituents of didymium; -- so called from the green color of its salts. Symbol Ps. Atomic weight 143.6.
    • The Century Dictionary and Cyclopedia
  • n. One of the two elements into which, in 1885, Auer von Welsbach succeeded in resolving what had previously been known as didymium. See neodymium.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • 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
    • Hypernym
    Words that are more generic or abstract
    metallic element    metal   
     
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