Ā'ni-on, n.

n. [Gr. ἀνιών, neut. ἀνιόν, p. pr. of ἀνιέναι, to go up, from ἀνά, up, and ἰέναι, to go.] (Chem.) An electro-negative element, or the element which, in electro-chemical decompositions, is evolved at the anode;—opposed to cation. Faraday.