Definition of niobium noun from the Oxford Advanced Learner's Dictionary



BrE BrE//naɪˈəʊbiəm//
; NAmE NAmE//naɪˈoʊbiəm//
[uncountable] (symbol Nb)
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a chemical element. Niobium is a silver-grey metal used in steel alloys. Word Originmid 19th cent.: modern Latin, from Niobe, the queen of Thebes in Greek mythology, and by association with her father Tantalus (so named because the element was first found in the rare mineral tantalite).
See the Oxford Advanced American Dictionary entry: niobium