I″on (ī″ŏn), n. [Gr. ιὄν, neut, of ιὤν, p. pr. of ιἔναι to go.] (Elec. Chem.) One of the elements which appear at the respective poles when a body is subjected to electro-chemical decomposition. Cf. Anion, Cation.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.