Relating to or containing copper in its lower oxidation state, especially in compounds where copper has a +1 charge (Cu+).
From Latin 'cuprum' (copper) combined with the chemical suffix '-ous' meaning containing, specifically the lower oxidation state versus 'cupric' for the higher state.
Cuprous and cupric compounds are like twins with opposite personalities—cuprous oxide is the red, stable one used in fungicides, while cupric oxide is the aggressive blue one that stains your hands.
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