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thermion

[thurm-ahy-uh n, -on; thur-mee-uh n] /ˈθɜrmˌaɪ ən, -ɒn; ˈθɜr mi ən/
noun, Physics.
1.
an ion emitted by incandescent material.
Origin
1910-1915
1910-15; therm- + ion
Related forms
thermionic, adjective
thermionically, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for more thermionic

thermion

/ˈθɜːmɪən/
noun
1.
(physics) an electron or ion emitted by a body at high temperature
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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more thermionic in Science
thermion
  (thûr'mī'ən)   
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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