Origin of copperasMiddle English and 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 cuperōsa probably short for aqua cuprōsa copper water from Late Latin cuprum copper ; see copper 1.
- iron(II) sulfate.