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thermionic tube

noun, Electronics.
1.
a vacuum tube in which the cathode is heated electrically to cause the emission of electrons by thermal agitation.
Also called hot-cathode tube.
Origin
1925-1930
1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for thermionic tube

thermionic valve

noun
1.
an electronic valve in which electrons are emitted from a heated rather than a cold cathode
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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thermionic tube in Science
thermionic tube
  (thûr'mī-ŏn'ĭk)   
An electrical component, typically an electron tube, through which electric current flows via the emission of thermions from a heated cathode.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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