copperas

American  

[kop-er-uhs] / ˈkɒp ər əs /

noun

Chemistry.

1. ferrous sulfate.

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copperas British  

/ ˈkɒpərəs /

noun

1. a less common name for ferrous sulphate

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Etymology

Origin of copperas

1400–50; late Middle English coperas, variant of Middle English coperose < Medieval Latin ( aqua ) cuprōsa copperish (water). See copper ¹, -ose ¹

Example Sentences

Early mine operators realized that they could also extract copper from copperas.

From Washington Times • Jul. 3, 2017

Buy at a druggist's four ounces of the best blue Aleppo nut-galls; half an ounce of green copperas; and half an ounce of clean, white gum-arabic.

From The Ladies' Guide to True Politeness and Perfect Manners or, Miss Leslie's Behaviour Book by Leslie, Eliza

Among them was Cornelius Devoz, to whom was granted the privilege of "mining and digging in our Realm of England for allom and copperas."

From De Re Metallica, Translated from the First Latin Edition of 1556 by Agricola, Georgius

With the addition of copperas it yields a black dye.

From The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide by Various

Premises.—Cellars, yards, stables, gutters, privies, cesspools, water-closets, drains, sewers, etc. should be frequently and liberally treated with copperas solution.

From A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases by Various