Niobium - Definition
niobium
n 1: a soft grey ductile metallic element used in alloys; occurs
in niobite; formerly called columbium [syn: niobium,
Nb, atomic number 41]
n 1: a soft grey ductile metallic element used in alloys; occurs
in niobite; formerly called columbium [syn: niobium,
Nb, atomic number 41]