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[kop-er-uh s] /ˈkɒp ər əs/
noun, Chemistry.
Origin of copperas
late Middle English
1400-50; late Middle English coperas, variant of Middle English coperose < Medieval Latin (aqua) cuprōsa copperish (water). See copper1, -ose1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for copperas
Historical Examples
  • It was black, but the copperas would eat the paper after a while.

  • Alum and copperas have been known in the Highlands long ages.

    Vegetable Dyes

    Ethel M. Mairet
  • Put the wool into this for 1/2 hour; then return it into the alum and copperas for 10 to 15 minutes.

    Vegetable Dyes

    Ethel M. Mairet
  • We're goin' up to copperas Creek and there ain't a thing in that.

    Mitch Miller Edgar Lee Masters
  • The amount of copperas should be from one and a half to twice that of the indigo.

  • Then boil them, and put in a piece of copperas, as large as a hen's egg.

    A Treatise on Domestic Economy

    Catherine Esther Beecher
  • Miss copperas had said, when I hinted so to her on first trying it, that it wanted “age.”

  • Captain copperas owes me a small account, and I want it settled.

  • Captain copperas had forgotten to settle for it, he said—if he had gone away.

  • I followed him to Lydia's cabin, where he compelled her to drink this solution of copperas.

    Fifty Years in Chains Charles Ball
British Dictionary definitions for copperas


a less common name for ferrous sulphate
Word Origin
C14: coperose, via Old French from Medieval Latin cuperosa, perhaps originally in the phrase aqua cuprosa copper water
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
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