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alum

 
Noun alum has 4 senses
  1. alum, ammonia alum, ammonium alum - a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
    --1 is a kind of aluminum, aluminium, Al, atomic number 13; double salt
  2. alum, potassium alum, potash alum - a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
    --2 is a kind of aluminum, aluminium, Al, atomic number 13; double salt
  3. alumnus, alumna, alum, graduate, grad - a person who has received a degree from a school (high school or college or university)
    --3 is a kind of scholar, scholarly person, student
    --3 has particulars: Ivy Leaguer; old boy
  4. alum - a double sulphate of aluminum and potassium that is used as an astringent (among other things)
    --4 is a kind of
    astringent, astringent drug, styptic
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