potassium alum

Definitions of potassium alum
  1. noun
    a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
    synonyms: alum, potash alum
    see moresee less
    type of:
    Al, aluminium, aluminum, atomic number 13
    a silvery ductile metallic element found primarily in bauxite
    double salt
    a solution of two simple salts that forms a single substance on crystallization
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