cobaltous

[ koh-bawl-tuhs ]

/ koʊˈbɔl təs /

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adjective

containing bivalent cobalt.

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Origin of cobaltous

First recorded in 1860–65; cobalt + -ous

Words nearby cobaltous

cobalt blue, cobalt bomb, cobalt green, cobaltic, cobaltite, cobaltous, cobaltous hydroxide, cobalt violet deep, cobalt violet light, cobalt yellow, Cobb

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use cobaltous in a sentence

Bromine water is a convenient agent for oxidizing cobaltous to cobaltic ions (see Chapter XV).
The Elements of Qualitative Chemical Analysis, vol. 1, parts 1 and 2.|Julius Stieglitz
Cobaltous hydroxide, Co(OH)2, is formed when a cobaltous salt is precipitated by caustic potash in the absence of air.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5|Various
It is readily soluble in warm dilute mineral acids forming cobaltous salts.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5|Various
It dissolves in acids forming cobaltous salts, and on exposure to air it rapidly absorbs oxygen, turning brown in colour.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5|Various

For the action of ammonia on the cobaltous salts in the presence of air see Cobaltammines (below).
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5|Various

British Dictionary definitions for cobaltous

cobaltous

/ (kəʊˈbɔːltəs) /

adjective

of or containing cobalt in the divalent state

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012