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1. WordNet® 3.0 (2006)
columbium
    n 1: a former name for niobium
2. The Collaborative International Dictionary of English v.0.48
Columbium \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.
   [1913 Webster]
3. The Collaborative International Dictionary of English v.0.48
niobium \ni*o"bi*um\, n. [NL., fr. L. & E. Niobe.] (Chem.)
   The chemical element of atomic number 41. Chemical symbol Nb.
   Atomic weight 92.91. Previously called columbium. See also
   Columbium.
   [1913 Webster]
4. The Elements (07Nov00)
columbium
The original name for niobium.
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