n. 1 a double sulphate of aluminium and potassium. 2 any of a group of compounds of double sulphates of a monovalent metal (or group) and a trivalent metal.
[ ME f. OF f. L alumen aluminis ]
ALUM
Meaning of ALUM in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012