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

I sometimes spray with lime and copperas, and have not been very successful.

From The Apple by Various

Sprays April 1, April 30, and June 1, with London purple, copperas, Paris green, and Bordeaux mixture.

From The Apple by Various

Remedies are variously compounded, of blue vitriol, verdigris, tar, spirits of turpentine, alum, saltpetre, salt, lime, copperas, white-lead, antimony, alcohol, urine, vinegar, &c., all of which have proved effectual.

From Domestic Animals History and description of the horse, mule, cattle, sheep, swine, poultry and farm dogs; with directions for their management, breeding, crossing, rearing, feeding, and preparation for a profitable market; also their diseases and remedies. Together with full directions for the management of the dairy. by Allen, Richard L.

Boil a small quantity of copperas with logwood, and it will dye gut properly.

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