Found 2 items, similar to niobium.
English → English (WordNet) Definition: niobium niobium n : a soft gray ductile metallic element used in alloys; occurs in niobite; formerly called columbium [syn: Nb, atomic number 41 ]
English → English (gcide) Definition: niobium 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] 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]