alumen

(S,-loo'men) (U.S and^ Br.). Alum, pota ium alum (U.S.), pota ium or ammonium alum (Br.), a double sulphate of aluminum and pota ium or aluminum and ammonium; astringent and styptic, employed externally, and occasionally internally in doses of gr. 3-15 (0.3-1.0), or as an emetic in doses of 51-4 (4.0-16.0). a. exsicca'tum (U.S.), dried alum, burnt alum, alumen ustum; alum deprived of its water of crystallization by heat, occurring in the form of a white granular powder; used externally as an astringent dusting powder, a. us'tum, a. exsiccatum.