Niobium

[nai'әubiәm]

解释:

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

手打:柯尔斯顿--From WordNet

解释:

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

编辑:默里

解释:

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

手打:菲尔