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Noun: blue vitriol  bloo'vit-ree-ul
  1. Hydrated blue crystalline form of copper sulphate
    "Gardeners use blue vitriol as a fungicide to protect plants";
    - blue copperas, blue stone, chalcanthite

Type of: copper sulfate, copper sulphate [Brit, Cdn], cupric sulfate, cupric sulphate [Brit, Cdn]

Encyclopedia: Blue vitriol