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Definition of alum:

  1. A double sulphate formed of aluminium and some other element ( esp. an alkali metal) or of aluminium. It has twenty- four molecules of water of crystallization.
  2. To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.


alumna, campus, grad, coed, fresher, grade, alumnus, auditor, bmp, dropout, potassium alum, graduate, Big Man on Campus, ammonia alum, ammonium alum, potash alum.

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