vanadiousadj.
/vəˈneɪdɪəs/ Chemistry.
Containing vanadium in its lower valency, as opposed to vanadic adj.
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vanadous1850
vanadious1868
1868 H. Watts Dict. Chem. V. 988 Vanadious phosphate and sulphate have been obtained in definite crystals.
1870 London, Edinb., & Dublin Philos. Mag. 4th Ser. 40 63 Vanadious salt.
This entry has not yet been fully updated (first published 1916; most recently modified version published online June 2018).
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adj.1868