Plutonium

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The American Heritage® Dictionary of the English Language, 4th Edition
  • n. A naturally radioactive, silvery, metallic transuranic element, occurring in uranium ores and produced artificially by neutron bombardment of uranium. Its longest-lived isotope is Pu 244 with a half-life of 76 million years. It is a radiological poison, specifically absorbed by bone marrow, and is used, especially the highly fissionable isotope Pu 239, as a reactor fuel and in nuclear weapons. Atomic number 94; melting point 640°C; boiling point 3,235°C; specific gravity 19.84; valence 3, 4, 5, 6. See Table at element.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. The transuranic chemical element with atomic number 94 and symbol Pu.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • n. a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239
    • Hypernym
    Words that are more generic or abstract
    chemical element    element   
    Hyponym
    plutonium 239   
    Rhyme
    Words with the same terminal sound
    ammonium    harmonium    pandemonium    polonium    zirconium   
    Same Context
    Words that are found in similar contexts
    uranium    tritium    antimatter    deuterium    thorium   
     
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