[ thurm-ahy-uhn, -on; thur-mee-uhn ]
/ ˈθɜrmˌaɪ ən, -ɒn; ˈθɜr mi ən /
an ion emitted by incandescent material.
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OTHER WORDS FROM thermiontherm·i·on·ic, adjectivetherm·i·on·i·cal·ly, adverb
Words nearby thermion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for thermion
/ (ˈθɜːmɪən) /
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
Scientific definitions for 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.