A positively-charged ion. All cations are metallic, with the exception of ammonium.

Cat"i*on (?), n. [Gr. downward + going, p. pr. of to go.] Chem.

An electro-positive substance, which in electro-decomposition is evolved at the cathode; -- opposed to anion.

Faraday.

 

© Webster 1913.

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