thermionic valve thermionic vacuum tube • thermistor · · · Info · Definitions · Synonyms · Characters · · thermionic valve · · Text Common · · Latin · · Scripts 16 · · 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 thermionic tube · · Synonym 4 electron tube · · Synonym 5 Characters · · space U+0020 a latin small letter a U+0061 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 l latin small letter l U+006C 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 v latin small letter v U+0076