The Simple English Wikipedia has an article on: Anion Pronunciation (US) enPR: ăn'-ī-ŏn IPA (key): /ˈæn.aɪ.ɑn/ (UK) IPA (key): /ˈæn.aɪ.ɒn/ Audio (UK)(file) Noun Singular anion Plural anions (countable) (chemistry) An anion is a negatively charged ion. Antonym: cation Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads