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

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Example Sentences

See Examples For:

copperas

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

From Washington Times ● Jul. 3, 2017

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 Georgius Agricola

A tawny cinnamon may be dyed from stone crottle or madder, mixed with turmeric, alum, and a little tartar, these must be gently boiled in fresh stuff, adding a little copperas.

From Blacker's Art of Fly Making, &c. Comprising Angling, & Dyeing of Colours, with Engravings of Salmon & Trout Flies by William Blacker

Beautiful shades of brown, green, blue and red may be obtained by using logwood, indigo, fustic, cutch, madder, cochineal, and copperas.

From Practical Basketry by Anna A. Gill

Cotton is dyed by means of the "lime and copperas vat," the "zinc powder vat," or the "hydrosulphite vat."

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" by Various

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