English noun: alum |
1. | alum (substance) a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum |
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| Synonyms | ammonia alum, ammonium alum |
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| Broader (hypernym) | Al, aluminium, aluminum, atomic number 13, double salt |
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2. | alum (substance) a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum |
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| Synonyms | potash alum, potassium alum |
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| Broader (hypernym) | Al, aluminium, aluminum, atomic number 13, double salt |
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3. | alum (person) a person who has received a degree from a school (high school or college or university) |
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| Synonyms | alumna, alumnus, grad, graduate |
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| Broader (hypernym) | bookman, scholar, scholarly person, student |
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| Narrower (hyponym) | Ivy Leaguer, old boy |
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4. | alum (artifact) a double sulphate of aluminum and potassium that is used as an astringent (among other things) |
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| Broader (hypernym) | astringent, astringent drug, styptic |
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