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columbium: Meaning and Definition of

co•lum•bi•um

Pronunciation: (ku-lum'bē-um), [key]
— n. Chem.
  1. (formerly) niobium. Symbol: Cb
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
columbite columbous
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