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