blue vitriol

/blu ˌvɪtriəl/
IPA guide

Definitions of blue vitriol
  1. noun
    hydrated blue crystalline form of copper sulfate
    synonyms: blue copperas, blue stone, chalcanthite
    see moresee less
    type of:
    copper sulfate, copper sulphate, cupric sulfate, cupric sulphate
    a copper salt made by the action of sulfuric acid on copper oxide
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