Alum vs. Alumni

Alumnoun

An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K2SO4.Al2(SO4)3.24H2O).

Alumnoun

(chemistry) Any similar double sulphate in which either or both of the potassium and aluminium is wholly or partly replaced by other univalent or tervalent cations.

Alumnoun

(US) A graduate of a university or other institution.

Alumverb

(transitive) To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.

Alumnoun

A double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization.

Alumverb

To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.

Alumnoun

a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum

Alumnoun

a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum

Alumnoun

a person who has received a degree from a school (high school or college or university)

Alumnoun

a double sulphate of aluminum and potassium that is used as an astringent (among other things)

Alum

An alum () is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula XAl(SO4)2·12H2O, where X is a monovalent cation such as potassium or ammonium. By itself, often refers to potassium alum, with the formula KAl(SO4)2·12H2O. Other alums are named after the monovalent ion, such as sodium alum and ammonium alum.

Alumninoun

plural of alumnus

Alumninoun

An individual alumnus or alumna.