copperas

[ kop-er-uh s ]
/ ˈkɒp ər əs /
|

noun Chemistry.

Origin of copperas

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