Origin of copperasMiddle English and amp; Old French coperose ; from Medieval Latin coperosium, probably ; from an unverified form (aqua) cuprosa, literally , copper (water) ; from Classical Latin cupreus, of copper
A green, crystalline heptahydrate mineral of ferrous sulfate, FeSO4·7H2O. Also called green vitriol.
Origin of copperasMiddle English coperose, a metallic sulfate, from Old French, from Medieval Latin cuper&omacron;sa, probably short for *aqua cupr&omacron;sa, copper water, from Late Latin cuprum, copper; see copper1.
- iron(II) sulfate.