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alum


Main Entry: 1al·um
Pronunciation: \ˈa-ləm\
Function: noun
Etymology: Middle English, from Anglo-French alum, alun, from Latin alumen
Date: 14th century

1 : a potassium aluminum sulfate KAl(SO4)2·12H2O or an ammonium aluminum sulfate NH4Al(SO4)2·12H2O used especially as an emetic and as an astringent and styptic
2 : any of various double salts isomorphous with potassium aluminum sulfate
3 : aluminum sulfate


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Learn more about "alum" and related topics at Britannica.com


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