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Definitions for alum

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  • A double sulphate of aluminum and potassium that is used as an astringent (among other things)

  • A person who has received a degree from a school (high school or college or university)

  • A white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum

  • A white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum

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