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A Writer's Dictionary:

alum Definition


Dictionary Home » Words Starting with A » alternative ... amber gambler » alum


alum
noun
    1. chem.
      Aluminium potassium sulphate, a white crystalline compound used in dyeing and tanning, and as a medical astringent to stop bleeding.
    2. Any of various double-sulphate salts with a similar composition to this compound.
Etymology: 14c: from Latin alumen.



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