English dictionary



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English noun: alum

1. alum (substance) a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum


Synonymsammonia alum, ammonium alum


Broader (hypernym)Al, aluminium, aluminum, atomic number 13, double salt

2. alum (substance) a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum


Synonymspotash alum, potassium alum


Broader (hypernym)Al, aluminium, aluminum, atomic number 13, double salt

3. alum (person) a person who has received a degree from a school (high school or college or university)


Synonymsalumna, alumnus, grad, graduate


Broader (hypernym)bookman, scholar, scholarly person, student


Narrower (hyponym)Ivy Leaguer, old boy

4. alum (artifact) a double sulphate of aluminum and potassium that is used as an astringent (among other things)


Broader (hypernym)astringent, astringent drug, styptic









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