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Definition of Thermion
1. Noun. An electrically charged particle (electron or ion) emitted by a substance at a high temperature. 
Definition of Thermion
1. an ion emitted by a heated body [n -S]
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1. Noun. An electrically charged particle (electron or ion) emitted by a substance at a high temperature. 
1. an ion emitted by a heated body [n -S]