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thermionic tube

noun, Electronics.
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 of thermionic tube
First recorded in 1925-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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thermionic tube in Science
thermionic tube
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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