Definitions for: Alum

[n] a double sulphate of aluminum and potassium that is used as an astringent (among other things)
[n] a person who has received a degree from a school (high school or college or university)
[n] a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
[n] a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum

Webster (1913) Definition: 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.

Al"um, v. t.
To steep in, or otherwise impregnate with, a solution of
alum; to treat with alum. --Ure.

Synonyms: alumna, alumnus, ammonia alum, ammonium alum, grad, graduate, potash alum, potassium alum

See Also: Al, aluminium, aluminum, astringent, astringent drug, atomic number 13, old boy, scholar, scholarly person, student, styptic

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