Of, containing, or relating to copper in its lower valence state (copper(I) as opposed to copper(II)).
From Latin 'cuprum' (copper) combined with the chemical suffix '-ose' meaning containing, specifically referring to the +1 oxidation state of copper.
Cuprous compounds have different properties than cupric compounds—like how cuprous oxide is red while cupric oxide is black, even though both are just copper and oxygen in different arrangements.
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