alum Meaning, definition in Cambridge English Dictionary
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Meaning of "alum" - English Dictionary

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alumnoun [U]

uk   us   /ˈæl.əm/ specialized
a chemical substance containing aluminium used in dyeing (= changing the colour of something) and as an astringent (= substance that causes skin to tighten)
(Definition of alum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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