- 1. n. A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite. Source: opted
- 2. n. a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium Source: wordnet
- 3. A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite. Hermann. Source: webster
- 4. A new metallic element, of doubtful genuineness and uncertainindentification, said to exist in certain minerals, as columbite.Hermann. Source: adambom
- 5. n. a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium Source: ecdict
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neptunium
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elementmetalliccertaincolumbitedoubtfulexistgenuinenessmineralsnewsaidamountsby-productfoundHermannoresplutoniumproductionradioactivetracetransuranicuncertainuranium