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alum

Pronunciation: al′ŭm

Definition: A double sulfate of aluminum and of an alkaline earth element or ammonium; chemically, an alum is any one of the markedly astringent double salts formed by a combination of a sulfate of aluminum, iron, manganese, chromium, or gallium with a sulfate of lithium, sodium, potassium, ammonium, cesium, or rubidium; used locally as a styptic.

[L. alumen]

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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