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1A colorless astringent compound that is a hydrated double sulfate of aluminum and potassium, used in solution medicinally and in dyeing and tanning.
- ‘Astringent varieties contain alum, which makes your mouth pucker when the fruits are eaten before they're fully ripe.’
- ‘It could also be treated by rubbing salt, brain or potash alum into the surface to produce a very pale leather.’
- ‘I have no idea how it's manufactured, but it's a kind of alum, a double sulfate of aluminum in crystal salt form.’
- ‘One site said that clarifying agents could control snails, so I sent my son to the chemist for alum.’
- ‘This, washed and then boiled, yielded aluminium sulphate, which, when ammonia was added, became alum.’
- 1.1 Any of a number of analogous crystalline double sulfates of a monovalent metal (or group) and a trivalent metal.
- ‘Several decades later the Englishman Davy attempted to obtain the metal hidden in alums.’
- ‘Aluminium dross tailings were used to produce two types of alums.’
Late Middle English: via Old French from Latin alumen, alumin-; related to aluta tawed leather.
An alumnus or alumna.‘a fellow Wellesley alum’
Late 19th century: abbreviation.
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