alum

2 entries found for alum.
To select an entry, click on it.

alum[1,noun] alum[2,noun]

Main Entry: ¹al·um
Pronunciation: 'a-l&m
Function: noun
Etymology: Middle English, from Anglo-French alum, alun, from Latin alumen
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