co·lum·bi·um /kəˈlʌmbiəm/
  鈳[金屬元素]
  co·lum·bi·um /kəˈləmbɪəm/ 名詞
  鈮
  Co·lum·bi·um n.  Chem. A rare element of the vanadium group, first found in a variety of the mineral columbite occurring in Connecticut, probably at Haddam. Atomic weight 94.2. Symbol Cb or Nb. Now more commonly called niobium.
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  columbium
       n : a former name for niobium
  columbium
  The original name for niobium.