thermionic tube

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:
1925–30

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World English Dictionary
thermionic valve or esp (US and Canadian) thermionic tube
 
n
an electronic valve in which electrons are emitted from a heated rather than a cold cathode
 
thermionic tube or esp (US and Canadian) thermionic tube
 
n

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American Heritage
Science Dictionary
thermionic tube   (thûr'mī-ŏn'ĭk)  Pronunciation Key 
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
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