alum
a·lum / ˈaləm/ • n. Chem. a colorless astringent compound, AlK(SO4)2.12H2O, a hydrated double sulfate of aluminum and potassium, used in solution medicinally and in dyeing and tanning. ∎ any of a number of analogous crystalline double sulfates of a monovalent metal (or group) and a trivalent metal.
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alum