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Noun: potassium alum  pu'ta-see-um 'a-lum
  1. A white crystalline double sulphate of aluminium: the potassium double sulphate of aluminium
    - alum, potash alum

Derived forms: potassium alums

Type of: Al, aluminium [Brit, Cdn], aluminum [N. Amer], atomic number 13, double salt

Encyclopedia: Potassium alum