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Answer for the clue "An electrically charged particle (electron or ion) emitted by a substance at a high temperature ", 8 letters:
thermion

Word definitions for thermion in dictionaries

WordNet Word definitions in WordNet
n. an electrically charged particle (electron or ion) emitted by a substance at a high temperature

Wiktionary Word definitions in Wiktionary
n. (context physics English) An electrically charged particle, either an electron or an ion, emitted by a conducting material at high temperatures