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thermionic valve

noun

, British.

thermionic valve

noun

  1. 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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Word History and Origins

Origin of thermionic valve1

First recorded in 1915–20
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Example Sentences

I have even made an attempt to understand the mystery that is called the Thermionic Valve.

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thermionic tubethermistor

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