| Alum | a double sulphate of aluminum and potassium that is used as an astringent (among other things) |
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| Alum | a person who has received a degree from a school (high school or college or university) |
| Alum | a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum |
| Alum | a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum |
| Alum | any of several herbs of the genus Heuchera |
| Alum | any of various forms of aluminum oxide occurring naturally as corundum |
| Alum | a compound of alumina and a metallic oxide |
| Alum | containing aluminum or alum |
| Alum | cover with aluminum |
| Alum | a silvery ductile metallic element found primarily in bauxite |
| Alum | a copper-aluminum alloy with high tensile strength and resistance to corrosion |
| Alum | a chloride used as a wood preservative or catalyst |