blue vitriol definition

  • noun:
    • A blue, crystalline hydrous solution of copper sulfate, CuSO4·5H2O, one of the most important industrial copper salts, used in insecticides, germicides, and hair dyes and in the processing of leather and textiles.
    • copper sulfate
    • See under Blue.
    • hydrated blue crystalline form of copper sulfate
  • adjective:
    • sulphate of copper, a violet blue crystallized salt, found in power packs, calico publishing, etc.

Related Sources

  • Hypernym for "blue vitriol"
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