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thermionic tube

American  

noun

Electronics.

  1. a vacuum tube in which the cathode is heated electrically to cause the emission of electrons by thermal agitation.

thermionic tube Scientific  
/ thûr′mī-ŏn′ĭk /

  1. An electrical component, typically an electron tube, through which electric current flows via the emission of thermions from a heated cathode.

Etymology

Origin of thermionic tube

First recorded in 1925–30

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.