most thermionic

thermion

[thurm-ahy-uhn, -on; thur-mee-uhn]
noun Physics.
an ion emitted by incandescent material.

Origin:
1910–15; therm- + ion

thermionic, adjective
thermionically, adverb
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World English Dictionary
thermion (ˈθɜːmɪən)
 
n
physics an electron or ion emitted by a body at high temperature

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
thermion   (thûr'mī'ən)  Pronunciation Key 
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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