al|um1 «AL uhm», noun.
1. a whitish mineral salt used in medicine and in dyeing; potash alum. A pencil of alum is sometimes used to stop the bleeding of a small cut. Formula: KAI(SO4)2•12H2O
2. a colorless, crystalline salt containing ammonia, used in baking powder, foam fire extinguishers, the purification of drinking water, and in medicine; ammonia alum. Formula: NH4Al(SO4)2•12H2O
3. any one of a group of double salts analogous to and including potash alum, formed by the union of the sulfate of a trivalent metal, such as aluminum, chromium, or iron, with the sulfate of a monovalent alkali metal or ammonium.
4. U.S. = aluminum sulfate. (Cf.aluminum sulfate)
[< Old French alum < Latin alūmen]
al|um2 «AL uhm», noun.
a graduate or former student of a particular school: »

The theater was filled with Shakespeare Academy alums.

[ shortening of alumnus]

Useful english dictionary. 2012.

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