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Definitions of alum
  1. noun
    a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
  2. noun
    a person who has received a degree from a school (high school or college or university)
  3. noun
    a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
  4. noun
    a double sulphate of aluminum and potassium that is used as an astringent (among other things)
Definition that contains alum
  • y a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
  • hall United States chemist who developed an economical method of producing aluminum from bauxite (1863-1914)
  • napalm gasoline jelled with aluminum soaps; highly incendiary liquid used in fire bombs and flamethrowers
  • turquoise a blue to grey green mineral consisting of copper aluminum phosphate
  • topaz a mineral (fluosilicate of aluminum) that occurs in crystals of various colors and is used as a gemstone
  • pfc a powerful greenhouse gas emitted during the production of aluminum
  • alum a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
  • alum a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
  • alum a double sulphate of aluminum and potassium that is used as an astringent (among other things)
  • mica any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
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