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1. (n.) neptunium
a short-lived radioactive transuranic element produced in nuclear reactors by the neutron bombardment of U-238.
Etymology: (1940–45; Neptune+ -ium2)
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| Definition of 'neptunium' |
Princeton's WordNet |
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1. (noun) neptunium, Np, atomic number 93
a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
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Webster Dictionary |
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1. (noun) neptunium
a new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite
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| Definition of 'neptunium' |
U.S. National Library of Medicine |
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1. neptunium
Neptunium. A radioactive element of the actinide metals family. It has the atomic symbol Np, atomic number 93, and atomic weight 237.
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Definitions of neptunium 
