Also found in: Medical, Encyclopedia, Wikipedia.


A green, crystalline heptahydrate mineral of ferrous sulfate, FeSO4·7H2O. Also called green vitriol.

[Middle English coperose, a metallic sulfate, from Old French, from Medieval Latin cuperōsa, probably short for *aqua cuprōsa, copper water, from Late Latin cuprum, copper; see copper1.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Elements & Compounds) a less common name for ferrous sulphate
[C14: coperose, via Old French from Medieval Latin cuperosa, perhaps originally in the phrase aqua cuprosa copper water]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

fer′rous sul′fate

a bluish green solid, FeSO4∙7H2O, used in the manufacture of other iron salts, in sewage treatment and fertilizers, and in the treatment of anemia. Also called copperas .
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in classic literature ?
The soil of this immense region is strongly impregnated with sulphur, copperas, alum, and glauber salts; its various earths impart a deep tinge to the streams which drain it, and these, with the crumbling of the banks along the Missouri, give to the waters of that river much of the coloring matter with which they are clouded.
Then it reached them through the Press that they habitually flogged to death good revenue-paying cultivators who neglected to stop earths; but that the few, the very few who did not die under hippohide whips soaked in copperas, walked about on their gangrenous ankle-bones, and were known in derision as the Mudir's Cranes.
Jack Quigg and Ryan Saunders scored for Copperas as the match finished all-square at 2-2 after extra-time.
LIVERPOOL'S Copperas Hill sorting office could close, Royal Mail bosses told union leaders yesterday.
The large, baroque-style pub has been a fixture on the corner of Lime Street and Copperas Hill for over 100 years.
Liverpool John Moores University has revealed a new image of whatits [pounds sterling]64m redevelopmentof the former Copperas Hill sorting office could look like.
Police swooped on homes in Ribble Road, Stoke, and Copperas Street, Aldermans Green, yesterday and took two 49-year-old men into custody.
He leaves his wife, Betty Folsom Landry, son David Landry of Worcester and daughter, Jacqueline Suero of Copperas Cove, TX, three step-daughters, Sandra Strand and Suzanne Folsom of New Hampshire, and Robin (Folsom) Borsook of Ma.
LIVERPOOL'S abandoned Copperas Hill postal sorting office is to be given a new lease of life - as the first-class "epicentre" of John Moores University.
The attack happened at around 1am on Saturday, November 1, when the 19-year-old was crossing the bridge over the A1 between Broad wood Road and Copperas in South West Denton, Newcastle.