English Explanatory Dictionary

copperas

English dictionary entry

Meanings

noun
  1. Iron(II) sulfate.
  2. An obsolete sulphate compound with one of the three metals, zinc, copper or iron.

Word forms

copperas copperases coperas

Etymology

From Middle English coperas, coperose (“metallic sulfate”), from Old French coperose. Compare French couperose (“sulfate”), Medieval Latin cuprosa, Late Latin aqua cuprosa, Latin cupri rosa, "rose of copper".

Synonyms

vitriol

Derived words

blue copperas green copperas white copperas yellow copperas
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