niobousadj.
/nʌɪˈəʊbəs/, U.S. /naɪˈoʊbəs/ Chemistry (disused).
Of, relating to, or derived from niobium.Intended to denote a lower oxidation state than niobic: see -ous suffix .
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niobous1863
1863 H. B. Jones & A. W. Hofmann Fownes's Man. Elem. Chem. (ed. 9) 366 With oxygen niobium forms two oxides of acid character, niobous acid, NbO, and niobic acid, NbO2.
1866 H. Watts Dict. Chem. IV. 49 The fused mass digested in water leaves niobous oxide.
1927–9 H. Wheeler Waverley Children's Dict. V. 2937/1 Niobous means derived from niobium.
This entry has been updated (OED Third Edition, September 2003; most recently modified version published online March 2022).
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adj.1863