Dictionary

1alum

noun al·um \ˈa-ləm\

Definition of ALUM

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
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Origin of ALUM

Middle English, from Anglo-French alum, alun, from Latin alumen
First Known Use: 14th century

Other Chemical Engineering Terms

alkali, cation, decant, hygroscopic, isotope, oxidize, slurry, solute, viscous

2alum

noun \ə-ˈləm\

Definition of ALUM

Origin of ALUM

by shortening
First Known Use: 1910

Other Education Terms

baccalaureate, colloquium, corequisite, dissertation, monograph, pedant, practicum, survey course, thesis

3alum

abbreviation

Definition of ALUM

Other Chemical Engineering Terms

alkali, cation, decant, hygroscopic, isotope, oxidize, slurry, solute, viscous
ALUM Defined for Kids

alum

noun al·um \ˈa-ləm\

Definition of ALUM for Kids

:  either of two aluminum compounds that are used especially in medicine (as to stop bleeding)
Medical Dictionary

alum

noun al·um \ˈal-əm\

Medical Definition of ALUM

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
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