Definition of "copper sulphate" []

• The common name for cupric sulphate, CuSO4, which forms blue crystals and is used in agriculture, dyeing, electroplating and many other applications; reducing agents reduce it to the red cuprous sulphate (noun)

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• "The train of thought led by imperceptible, but perfectly natural, steps to the idea of insect poisons, his own original job in the territory, and the stock of copper sulphate and arsenate of lead which was stored at the river mouth port, for use the following spring."
• "Blue vitriol is copper sulphate pentahydrate, CuSO4."