アニオンアニオンFreq.FrequencyTop 100,000Meanings1nounanionchemistryChemistry term for a negatively charged ion. Often contrasted with カチオン (cation).See also: 陰イオン塩えん化か物ぶつイオンは代だい表ひょう的てきなアニオンです。The chloride ion is a typical anion.