Alum
/ˈæl.əm/
Last Updated: January 2, 2026 at 12:30 PM
Scrabble:6 ptsWWF:9 pts4 letters
Definition of Alum
noun
- An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K2SO4·Al2(SO4)3·24H2O).
- Any similar double sulphate in which either or both of the potassium and aluminium is wholly or partly replaced by other univalent or tervalent cations.
Anagrams of Alum
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SYNONYMS
potash alum