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thermion

[thurm-ahy-uh n, -on; thur-mee-uh n]
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noun Physics.
  1. an ion emitted by incandescent material.
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Origin of thermion

First recorded in 1910–15; therm- + ion
Related formstherm·i·on·ic, adjectivetherm·i·on·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for thermion

thermion

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

thermion in Science

thermion

[thûrmī′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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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.