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).

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

(shortening, Canada, US) A past attendee or graduate (of either gender) of a college, university or other educational institution.

simple past tense and past participle of alum

present participle of alum

The treatment of a material with a solution of alum

(rare, inorganic chemistry) aluminic

Of or relating to a language family of central Nigeria, comprising Alumu, Toro, Sambe, and Hasha.

plural of aluming

plural of alum