'Columbium' definitions:

Definition of 'columbium'

From: WordNet
noun
A former name for niobium

Definition of 'Columbium'

From: GCIDE
  • 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]

Definition of 'columbium'

From: GCIDE
  • 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]

Definition of 'Columbium'

From: Elements
  • columbium The original name for niobium.