- ? (-?/-?) alum
Old to modern English dictionary. 2013.
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alum — alum1 /al euhm/, n. Chem. 1. Also called potash alum, potassium alum. a crystalline solid, aluminum potassium sulfate, K2SO4·Al2(SO4)3·24H2O, used in medicine as an astringent and styptic, in dyeing and tanning, and in many technical processes. 2 … Universalium