#initial-load-header-loader { visibility: hidden!important; } #initial-load-content { visibility: visible!important; } .expandable .expandable-control { display: none!important; } .expandable .expandable-content { display: block!important; visibility: visible!important; max-height: none!important; height: auto!important; }

thermionic tube

SEE MORE SYNONYMS FOR thermionic tube ON THESAURUS.COM

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.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for thermionic tube

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