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1 definition found
 for atomic number 84
From WordNet (r) 3.0 (2006) :

  atomic number 84
      n 1: a radioactive metallic element that is similar to tellurium
           and bismuth; occurs in uranium ores but can be produced by
           bombarding bismuth with neutrons in a nuclear reactor [syn:
           polonium, Po, atomic number 84]

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