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ALUM

Definition:

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