Borrowed from Ancient Greek κατιόν (katión, “(thing) going down”), neuter past participle of κάτειμι (káteimi, “go down”), from κατά (katá, “down”) (see cata-) + εἶμι (eîmi, “go”). Coined by English polymath William Whewell in 1834 for Michael Faraday, who introduced it later that year.
cation (plural cations)
- (chemistry) A positively charged ion—opposed to anion.
- (chemistry) The ion in an electrolyzed solution that migrates to the cathode.