Alum

English word definition — powered by WordNet

NOUN

ammonia alum, ammonium alum

a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum

potassium alum, potash alum

a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum

alumnus, alumna, graduate, grad

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

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

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