potash alum

English Thesaurus

1. a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum (noun.substance)

hypernym	:	al, aluminium, aluminum, atomic number 13,
definition	:	a silvery ductile metallic element found primarily in bauxite (noun.substance)

hypernym	:	double salt,
definition	:	a solution of two simple salts that forms a single substance on crystallization (noun.substance)