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Noun: white vitriol  wIt vit-ree-ul
Usage: archaic
  1. A colourless crystalline compound (ZnSO₄) used in medicines, supplements, fertilizers, and industrial processes
    "white vitriol is sometimes added to fortified cereals";
    - zinc sulfate, zinc sulphate, zinc vitriol

Type of: sulfate [N. Amer], sulphate [Brit, Cdn]

Encyclopedia: White vitriol