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Definitions of niobium
  1. noun
    a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium

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Definition that contains niobium
  • niobite a black mineral that is an ore of niobium and tantalum
  • columbium a former name for niobium
  • columbite a black mineral that is an ore of niobium and tantalum
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