alum

  1. Noun.  (chemistry) the double sulphate of potassium and aluminium with chemical formula K2SO4.Al2(SO4)3.24H2O.
  2. Noun.  (chemistry) Any similar double sulphate in which either or both of the potassium and aluminium is wholly or partly replaced by other univalent or tervalent cations.
  3. Noun.  (US) A graduate of a university or other institution.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.