alum

Noun
  1. A white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum (synset 114652485)
  2. A white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum (synset 114652297)
  3. A person who has received a degree from a school (high school or college or university) (synset 109805779)
  4. A double sulphate of aluminum and potassium that is used as an astringent (among other things) (synset 102703481)

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