thermionic tube

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

Origin of thermionic tube

First recorded in 1925–30
Also called hot-cathode tube. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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thermionic tube in Science

thermionic tube

  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.