Dictionary.com

copperas

[ kop-er-uhs ]
/ ˈkɒp ər əs /
Save This Word!

noun Chemistry.

ferrous sulfate.

QUIZZES

QUIZ YOURSELF ON PARENTHESES AND BRACKETS APLENTY!

Set some time apart to test your bracket symbol knowledge, and see if you can keep your parentheses, squares, curlies, and angles all straight!
Question 1 of 7
Let’s start with some etymology: What are the origins of the typographical word “bracket”?
First appeared around 1750, and is related to the French word “braguette” for the name of codpiece armor.
First appeared in 1610, based on the French word “baguette” for the long loaf of bread.
First appeared in 1555, and is related to the French word “raquette” for a netted bat.
TAKE THE QUIZ TO FIND OUT

Origin of copperas

1400–50; late Middle English coperas, variant of Middle English coperose<Medieval Latin (aqua) cuprōsa copperish (water). See copper1, -ose1

Words nearby copperas

copper, Copper Age, copperah, Copper and Stone Age, copper arsenite, copperas, Copperas Cove, copper beech, Copper Belt, copper-bottomed, copper-fasten
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for copperas

British Dictionary definitions for copperas

copperas
/ (ˈkɒpərəs) /

noun

a less common name for ferrous sulphate

Word Origin for copperas

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
See Today's Synonym