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Copperas . ( Or. inc. , cf. fr. couperose ). 1. f. name common to several native sulfate of copper, iron or zinc. Copperas blue. 1. f. copper sulphate, used in medicine and dyeing. Copperas white. 1. f. zinc sulfate. Copperas red. 1. f. variety of the Green, red or yellow ochre. Copperas green. 1. f. ferrous sulphate, used in dry cleaning.