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WORDNET DICTIONARY
Noun Columbium has 1 sense
CIDE DICTIONARY
Columbium, n. [NL., fr. Columbia America.].
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 . [1913 Webster]