thermion

American  

[thurm-ahy-uhn, -on, thur-mee-uhn] / ˈθɜrmˌaɪ ən, -ɒn, ˈθɜr mi ən /

noun

Physics.

1. an ion emitted by incandescent material.

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thermion British  

/ ˈθɜːmɪən /

noun

1. physics an electron or ion emitted by a body at high temperature

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thermion Scientific  

/ thûr′mī′ən /

1. An electrically charged particle or ion that is emitted by a heated conducting material. The electrons emitted from the cathodes of electron tubes (such as cathode ray tubes) are thermions.

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Other Word Forms

• thermionic adjective
• thermionically adverb

Etymology

Origin of thermion

First recorded in 1910–15; therm- + ion