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thermionic valve

noun, British.
Origin of thermionic valve
First recorded in 1915-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for thermionic valve
Historical Examples
  • I have even made an attempt to understand the mystery that is called the thermionic valve.

    The Tower of Oblivion Oliver Onions
British Dictionary definitions for thermionic valve

thermionic valve

an electronic valve in which electrons are emitted from a heated rather than a cold cathode
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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