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    alum

    alum - Dictionary definition and meaning for word alum

    Definition
    (noun) a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum Definition
    (noun) a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum Definition
    (noun) a person who has received a degree from a school (high school or college or university)
    Synonyms : alumna , alumnus , grad , graduate
    Definition
    (noun) a double sulphate of aluminum and potassium that is used as an astringent (among other things)
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