thermion Thermidorian • thermionic · · · Info · Definitions · Characters · · thermion · · Text Latin · · Script 8 · · Length Definitions · · · (noun) an electrically charged particle (electron or ion) emitted by a substance at a high temperature. · · Noun Definition 1 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074