ion iomyfdyn • ion beam · · · Info · Definitions · Characters · · ion · · Text Latin · · Script 3 · · Length 2 · · Syllables Definitions · · · (noun) a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons. · · Noun Definition 1 Characters · · i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F