thermionic tube thermionics • thermionic vacuum tube · · · Info · Definitions · Synonyms · Characters · · thermionic tube · · Text Common · · Latin · · Scripts 15 · · Length 4 · · Syllables Definitions · · · (noun) electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope. Synonyms: tube, vacuum tube, thermionic vacuum tube, thermionic tube, electron tube, thermionic valve. · · Noun Definition 1 Synonyms · · · tube · · Synonym 1 vacuum tube · · Synonym 2 thermionic vacuum tube · · Synonym 3 electron tube · · Synonym 4 thermionic valve · · Synonym 5 Characters · · space U+0020 b latin small letter b U+0062 c latin small letter c U+0063 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 u latin small letter u U+0075