ammonia alum

/əˌmoʊniə ˌæləm/
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Other forms: ammonia alums

Definitions of ammonia alum
  1. noun
    a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
    synonyms: alum, ammonium 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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