Noun: potassium alum pu'ta-see-um 'a-lum
- A white crystalline double sulphate of aluminium: the potassium double sulphate of aluminium
"Potassium alum is commonly used in water purification";
- alum, potash alum
Derived forms: potassium alums
Type of: Al, aluminium [Brit, Cdn], aluminum [N. Amer], atomic number 13, double salt
Encyclopedia: Potassium alum