ALUM

Definition

1. noun a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum. — synonyms: ammonia_alum, ammonium_alum
2. noun a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum. — synonyms: potassium_alum, potash_alum
3. noun a person who has received a degree from a school (high school or college or university). — synonyms: alumnus, alumna, graduate, grad
4. noun a double sulphate of aluminum and potassium that is used as an astringent (among other things).