Containing silver in composition; applied to compounds containing silver in twice the proportion of that in those called argentic, as argentous chloride, Ag2Cl; argentous oxide, Ag4O, suboxide or hemioxide of silver.
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argentous1869
1869 H. E. RoscoeLessons Elem. Chem. (new ed.) xxv. 255 A small quantity of argentous chloride.