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nouna former name for niobiumtype of:
Definition that contains columbium
- nb a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
- atomic number 41 a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
- niobium a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium