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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

I am tired of nosing drains and buying copperas and hounding the latent plumber that he adjust the water-pipes.

From Rosemary and Rue by Amber

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

From The Apple by Various

The argil and soda soften the dye stuff of the copperas, but a small quantity must be put in.

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

Green olive may be made with a little more copperas and verdigris.

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