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Alum
01
a person who has received a degree from a school (high school or college or university)
02
a double sulphate of aluminum and potassium that is used as an astringent (among other things)
03
a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
04
a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
Example
Tanners use mordant chemicals like alum, chrome, and vegetable tannins to set dyes and preserve animal hides during the leather-making process.
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