Niobium
WordNet
noun
(1) A soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
WiktionaryText
Noun
- a metallic chemical element (symbol Nb) with an atomic number of 41.
See also
- columbite
- columbite-tantalite
- coltan
- euxenite
- pyrochlore