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Definición de “alum” en inglés

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alum

noun [U] uk   /ˈæl.əm/ specialized us  
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 Learner's Dictionary & Thesaurus © Cambridge University Press)
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