ALUM

Definition of ALUM

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