blue vitriol: Meaning and Definition of
— Chem., Mineral. Chem.,Mineral.
- a salt, copper sulfate, CuSO&multiplydot;5HO, occurring naturally as large transparent, deep-blue triclinic crystals, appearing in its anhydrous state as a white powder: used chiefly as a mordant, insecticide, fungicide, and in engraving. Also called