Definify.com
Webster 1913 Edition
Anion
An′i-on
,Noun.
[Gr. [GREEK], neut. [GREEK], p. pr. of [GREEK] to go up; [GREEK] up + [GREEK] to go.]
(Chem.)
An electro-negative atom or group of atoms, or the element which, in electro-chemical decompositions, is evolved at the anode; – opposed to
cation
. Faraday.