noun Chemistry.

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. 2014.
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World English Dictionary
copperas (ˈkɒpərəs)
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 & Unabridged 10th Edition
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Example sentences for copperas
The city of copperas cove is served by the copperas cove independent school district.
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