Neptunium Synonyms & Definitions

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• NeptuniumDefinition & Meaning in English

  1. (n.) A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite.
  2. (n.) A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite.

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