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What is "columbium"

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columbium
The Collaborative International Dictionary
columbium

niobium \ni*o"bi*um\, n. [NL., fr. L. & E. Niobe.] (Chem.) The chemical element of atomic number 4

  1. Chemical symbol Nb. Atomic weight 9

  2. 91. Previously called columbium. See also Columbium.

Wiktionary
columbium

n. (context obsolete English) (non-gloss definition: A former name of) niobium.

WordNet
columbium

n. a former name for niobium