ION Antonyms There are 4 antonyms of the word ion. (opposite meanings)Did you mean?Definition of IONAlso try opposite words for..ionsionicionateioniseionizeBest Opposite Words For IONTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1anionnounn2atomnounn3cationnounn4moleculenounn Alternatives for ANION Words (10)atomcathodecationchlorideelectrodeelectronhalidenegativepositivevalenceOpposite words for anion Alternatives for ATOM Words (11)moleculeparticleelectronleptonneutronnucleusprotonquarkcorpusclemotespeckPhrases (1)subatomic particleOpposite words for atom Alternatives for MOLECULE Words (5)atomcorpusclemoteparticlespeckOpposite words for molecule