Definitions for ALUMˈæl əm
This page provides all possible meanings and translations of the word ALUM
Random House Webster's College Dictionary
a crystalline solid, aluminum potassium sulfate, K2SO4∙Al2(SO4)3∙24H2O, used as an astringent and styptic and in dyeing and tanning.
any of a class of analogous double sulfates.
Origin of alum:
1275–1325; ME < AF < L alūmen
an alumna or alumnus.
Origin of alum:
alum, ammonia alum, ammonium alum(noun)
a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
alum, potassium alum, potash alum(noun)
a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
alumnus, alumna, alum, graduate, grad(noun)
a person who has received a degree from a school (high school or college or university)
a double sulphate of aluminum and potassium that is used as an astringent (among other things)
a double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization
to steep in, or otherwise impregnate with, a solution of alum; to treat with alum
Alum is both a specific chemical compound and a class of chemical compounds. The specific compound is the hydrated potassium aluminium sulfate with the formula KAl(SO4)2·12H2O. More widely, alums are double sulphate salts, with the formula AM(SO4)2·12H2O, where A is a monovalent cation such as potassium or ammonium and M is a trivalent metal ion such as aluminium or chromium.
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