Copperas meaning

kŏp'ər-əs
A green, crystalline heptahydrate mineral of ferrous sulfate, FeSO4 · 7H2 O.
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A green, crystalline heptahydrate mineral of ferrous sulfate, FeSO4 · 7H2 O.
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Iron(II) sulfate.
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Origin of copperas

  • Middle English coperose a metallic sulfate from Old French from Medieval Latin cuperōsa probably short for aqua cuprōsa copper water from Late Latin cuprum copper copper1
    From American Heritage Dictionary of the English Language, 5th Edition