alum

views updated

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.

alum

views updated

alum XIV. — OF. alum (mod. alun) :- L. alūmen.