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copperas

   Also found in: Encyclopedia, Wikipedia 0.20 sec.
cop·per·as  (kpr-s)
n.
See ferrous sulfate.
[Middle English coperose, a metallic sulfate, from Old French, from Medieval Latin cupersa, probably short for *aqua cuprsa, copper water, from Late Latin cuprum, copper; see copper1.]


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The soil of this immense region is strongly impregnated with sulphur, copperas, alum, and glauber salts; its various earths impart a deep tinge to the streams which drain it, and these, with the crumbling of the banks along the Missouri, give to the waters of that river much of the coloring matter with which they are clouded.
Astoria or Anecdotes of an enterprise beyond the Rocky Mountains by Irving, Washington View in context
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