electron tube

noun

Definition of electron tube 

: an electronic device in which conduction by electrons takes place through a vacuum or a gaseous medium within a sealed glass or metal container and which has various uses based on the controlled flow of electrons

First Known Use of electron tube

1919, in the meaning defined above

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The first known use of electron tube was in 1919

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electron tube

noun

Kids Definition of electron tube

: a device in which conduction of electricity by electrons takes place through a vacuum or a gas within a sealed container and which has various uses (as in radio and television)

More from Merriam-Webster on electron tube

Britannica.com: Encyclopedia article about electron tube

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