Alum
nounverified·updated May 18, 2026
a double sulphate of aluminum and potassium that is used as an astringent (among other things)
Framework senses
- §1
- a double sulphate of aluminum and potassium that is used as an astringent (among other things)
- §2
- a person who has received a degree from a school (high school or college or university)
- §3
- a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
- §4
- a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum