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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
thermionic is an adjective meaning "of or relating to or characteristic of thermions". It carries one recorded sense.
of or relating to or characteristic of thermions
“thermionic cathode”
Definitions, synonyms and semantic relations for thermionic come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.
147,478 entries in AltF Lexicon, every one with its syllables marked.
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