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copper sulfate
a blue, crystalline substance, CuSO·5HO, that effloresces and turns white when heated; blue vitriol: used in making pigments, germicides, batteries, etc.
See copper sulfate in American Heritage Dictionary 4
noun
A poisonous blue crystalline copper salt, CuSO4·5H2O, used in agriculture, textile dyeing, leather treatment, electroplating, and the manufacture of germicides.
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