(chemistry) Any cation formed by the addition of a proton to the nitrogen or oxygen atom of an amide or derivative.

(chemistry) A cation formed by protonation of an amine - R₃NH⁺.

(organic chemistry) Any cation formed by the addition of a proton or other cationic species to an arene.

(obsolete, chemistry) An arenium ion.

(chemistry) the cation H₂As⁺ derived from arsine / (chemistry) any organic derivative of this cation

(organic chemistry) Any arenium ion derived from benzene or its derivatives.

(obsolete, organic chemistry) A benzenium ion.

(chemistry) any halonium ion in which the halogen is fluorine

(chemistry) any halonium ion in which the halogen is iodine

(chemistry) Any halonium ion in which the halogen is bromine.