Noun: blue copperas bloo'kó-pu-rus
- Hydrated blue crystalline form of copper sulphate
"Gardeners use blue copperas as a fungicide to protect plants";
- blue vitriol, blue stone, chalcanthite
Type of: copper sulfate, copper sulphate [Brit, Cdn], cupric sulfate, cupric sulphate [Brit, Cdn]
Encyclopedia: Blue copperas