thermionic tube

noun Electronics.

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. 2019

Related Words for thermionic tube


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