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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Nearby Word
neptunium, neptunian, neptune, napatutunayan, nĂ¡pataon, nevadan, novatian, novation, naphthene, nabibitin, nymphotomy
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