FinnHun Finnish-Hungarian-English on-line dictionary and thesaurus

n 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). (defdate|from 14th c.)

n (chemistry) 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. (defdate|from 17th c.)

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

n (US) A graduate of a university or other institution.