al·um
n 1 : either of two colorless or white crystalline double sulfates of aluminum used in medicine internally as emetics and locally as astringents and styptics a : one KAl(SO4)2·12H2O that is a sulfate of aluminum and potassium - called also potassium alum b : one consisting of an ammonium aluminum sulfate NH4Al(SO4)2·12H2O - called also ammonia alum , ammonium alum 2 : any of various double salts isomorphous with potassium aluminum sulfate .
     
Published under license with Merriam-Webster, Incorporated. © 1997-2024.
|
|
 |
