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doc Definition of neptunium
    English to English
    noun
  • a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
  • source: WordNet 3.0
  • A new metallic element, of doubtful genuineness and uncertain identification, said to exist in certain minerals, as columbite.
  • source: Webster 1913
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