1. a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium; [syn: niobium, Nb, atomic number 41]
WordNet (r) 3.0 (2006):
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]