thermion

[ thurm-ahy-uhn, -on; thur-mee-uhn ]
See synonyms for: thermionthermionic on Thesaurus.com

nounPhysics.
  1. an ion emitted by incandescent material.

Origin of thermion

1
First recorded in 1910–15; therm- + ion

Other words from thermion

  • therm·i·on·ic, adjective
  • therm·i·on·i·cal·ly, adverb

Words Nearby thermion

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

British Dictionary definitions for thermion

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

Scientific definitions for thermion

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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