niobiumPronunciation: /nʌɪˈəʊbɪəm/Definition of niobium noun [mass noun] the chemical element of atomic number 41, a silver-grey metal of the transition series, used in superconducting alloys. (Symbol: Nb)Origin: mid 19th century: modern Latin, from Niobe, by association with her father Tantalus (so named because the element was first found in tantalite)niobium in other Oxford dictionaries Definition of niobium in the US English dictionary
