Definitions of alum:
- noun: a double sulphate of aluminum and potassium that is used as an astringent (among other things)
- noun: a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
- noun: a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
- noun: a person who has received a degree from a school (high school or college or university)
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