Niobium

[nai'әubiәm]

(noun.) a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium.

Inputed by Kirsten--From WordNet

(n.) A later name of columbium. See Columbium.

Typist: Murray

n. a rare metal steel-gray in colour discovered in the mineral Tantalite—sometimes called Columbium.

Typist: Phil