niobium
Concise Oxford English Dictionary © 2008 Oxford University Press:
niobium /nʌɪˈəʊbɪəm/
▶noun the chemical element of atomic number 41, a silver-grey metal used in superconducting alloys. (Symbol: Nb)
– origin C19: mod. L., from Niobe, daughter of Tantalus in Greek mythology (because the element was first found in tantalite).
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