niobium(n = noun.substance) atomic number 41, nb - a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium;
is a kind of metal, metallic element
has particulars: columbium
The chemical element of atomic number 41. Chemical symbol Nb. Atomic weight 92.91. Previously called
niobium, n. Chem. a rare grey-blue metallic transition element occurring naturally in several minerals and used in alloys for superconductors.
Usage:
Symb.: Nb. Also called COLUMBIUM.
Derivative:
niobic adj. niobous adj.
Etymology:
Niobe daughter of Tantalus: so called because first found in TANTALITE