Niobium

4 definitions found

From The Collaborative International Dictionary of English v.0.48 [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]

From The Collaborative International Dictionary of English v.0.48 [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]

From WordNet (r) 2.0 [wn]:

  niobium
       n : a soft gray ductile metallic element used in alloys; occurs
           in niobite; formerly called columbium [syn: {Nb}, {atomic
           number 41}]

From Elements database 20001107 [elements]:

  niobium
  Symbol: Nb
  Atomic number: 41
  Atomic weight: 92.906
  Soft, ductile grey-blue metallic transition element. Used in special
  steels and in welded joints to increase strength. Combines with halogens
  and oxidizes in air at 200 degrees celsius. Discovered by Charles Hatchett
  in 1801 and isolated by Blomstrand in 1864. Called {columbium} originally.