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1. (n.) alum
a crystalline solid, aluminum potassium sulfate, K
2. alum
any of a class of analogous double sulfates.
3. (n.) alum
an alumna or alumnus.
Etymology: (by shortening)
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| Definition of 'alum' |
Princeton's WordNet |
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1. (noun) alum, ammonia alum, ammonium alum
a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
2. (noun) alum, potassium alum, potash alum
a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
3. (noun) alumnus, alumna, alum, graduate, grad
a person who has received a degree from a school (high school or college or university)
4. (noun) alum
a double sulphate of aluminum and potassium that is used as an astringent (among other things)
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| Definition of 'alum' |
Webster Dictionary |
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1. (noun) alum
a double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization
2. (verb) alum
to steep in, or otherwise impregnate with, a solution of alum; to treat with alum
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Definitions of alum 
