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copperas

noun
cop·​per·​as | \ ˈkä-p(ə-)rəs How to pronounce copperas (audio) \

Definition of copperas

: ferrous sulfate

First Known Use of copperas

14th century, in the meaning defined above

History and Etymology for copperas

Middle English coperas, from Anglo-French coperose, from Medieval Latin cuprosa, probably from aqua cuprosa, literally, copper water, from Late Latin cuprum

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More Definitions for copperas

copperas

noun
cop·​per·​as | \ ˈkäp-(ə-)rəs How to pronounce copperas (audio) \

Medical Definition of copperas

: a green hydrated ferrous sulfate FeSO4·7H2O used especially in making inks and pigments —used especially of commercial grades not to be used internally

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