Einsteinium

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The American Heritage® Dictionary of the English Language, 4th Edition
  • n. A synthetic transuranic element first produced by neutron irradiation of uranium in a thermonuclear explosion and now usually produced in the laboratory by irradiating plutonium and other elements. Its longest-lived isotope is Es 254 with a half-life of 276 days. Atomic number 99; melting point 860°C. See Table at element.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. a transuranic chemical element (symbol Es) with atomic number 99.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • n. a radioactive transuranic element produced by bombarding plutonium with neutrons
    • Hypernym
    Words that are more generic or abstract
    metallic element    metal   
     
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