Bible Dictionaries
Alum

Webster's Dictionary

(1):

(v. t.) To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.

(2):

(n.) A double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization.

Bibliography Information
Webster, Noah. Entry for 'Alum'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​a/alum.html. 1828.