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Alum

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Noun Chemistry .

Also called potash alum , potassium alum. a crystalline solid, aluminum potassium sulfate, K 2 SO 4 ?Al 2 (SO 4 ) 3 ?24H 2 O, used in medicine as an astringent and styptic, in dyeing and tanning, and in many technical processes.
one of a class of double sulfates analogous to the potassium alum, as aluminum ammonium sulfate, having the general formula R 2 SO 4 ?X 2 (SO 4 ) 3 ?24H 2 O, where R is a univalent alkali metal or ammonium, and X one of a number of trivalent metals.
(not in technical use) aluminum sulfate.

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