alum noun - Definition, pictures, pronunciation and usage notes | Oxford Advanced American Dictionary at OxfordLearnersDictionaries.com

Definition of alum 1 noun from the Oxford Advanced American Dictionary

alum1

noun

NAmE//ˈæləm//

[uncountable]

a substance formed from aluminum and another metal, used, for example, to prepare leather and to change the color of things

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See alum in the Oxford Advanced Learner's Dictionary

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