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Definition of Columbeum

Co*lum"bi*um (?), n. [NL., fr. Columbia America.] (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.

- Webster's Unabridged Dictionary (1913)

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The correct Spelling of this word is: Columbium

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