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Alum Al"um, n. [OE. alum, alom, OF. alum, F. alun, fr. L.
alumen alum.] (Chem.)
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.
Note: Common alum is the double sulphate of aluminium and
potassium. It is white, transparent, very astringent,
and crystallizes easily in octahedrons. The term is
extended so as to include other double sulphates
similar to alum in formula.
Alum Al"um, v. t.
To steep in, or otherwise impregnate with, a solution of
alum; to treat with alum. --Ure.