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Definition of: copperas
(kop′ər·əs) noun
A green, crystalline, astringent ferrous sulfate, FeSO4·7H2O, used in dyeing, inkmaking, photography, etc.: also called green vitriol. [<MF couperose <Med. L cuperosa, cuprosa <(aqua) cuprosa copper (water) <LL cuprum. See COPPER.]
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