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copperas
Definitions
[ˈkɒp(ə)rəs], (Noun)
Definitions:
- green crystals of hydrated ferrous sulphate, especially as an industrial product
Phrases:
Origin
:
late Middle English coperose, from Old French couperose, from medieval Latin cuperosa, literally ‘flower of copper’, from late Latin cuprum (see copper) + rosa ‘rose’, translating Greek khalkanthon
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definition by Oxford Dictionaries