Definition of “alum” - English Dictionary

british dictionary

“alum” in British English

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alumnoun [ U ]

uk /ˈæl.əm/ us /ˈæl.əm/ specialized


  • It is much improved by adding a little pounded alum, while it is boiling.
  • Let it remain over night till all the alum is dissolved.
  • Salt and water is used by many as a gargle, but a little alum and honey dissolved in sage tea is better.
  • The most common dressing consists of equal parts of rock salt and alum dissolved in water.
  • To fix the colour alum is added in the boiling.

(Definition of “alum” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)