[mass noun]the chemical element of atomic number 41, a silver-grey metal of the transition series, used in superconducting alloys(Symbol: Nb) (化学元素)铌(符号:Nb)
niobic adjective niobous adjective 语源
mid 19th cent.: modern Latin, from Niobe, by association with her father Tantalus (so named because the element was first found in tantalite)