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Definitions for: Neptunium [n] a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
Webster (1913) Definition: Nep*tu"ni*um, n. [NL.]
A new metallic element, of doubtful genuineness and uncertain
indentification, said to exist in certain minerals, as
columbite.
Synonyms: atomic number 93, Np
See Also: metal, metallic element
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