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copperas

American  
[kop-er-uhs] / ˈkɒp ər əs /

noun

Chemistry.
  1. ferrous sulfate.


copperas British  
/ ˈkɒpərəs /

noun

  1. a less common name for ferrous sulphate

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

From Washington Times • Jul. 3, 2017

The copperas solution is easily prepared by hanging a basket containing about sixty pounds of copperas in a barrel of water.

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

With the addition of copperas it yields a black dye.

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

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

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