- 1. n. A later name of columbium. See Columbium. Source: opted
- 2. n. a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium Source: wordnet
- 3. n:100 n. a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium Source: ecdict
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niobium
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