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doc Definition of columbium
    English to English
    noun
  • a former name for niobium
    • source: WordNet 3.0
  • 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.
    • source: Webster 1913
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