phototube

noun
pho·​to·​tube | \ ˈfō-tō-ˌtüb How to pronounce phototube (audio) , -ˌtyüb\

Definition of phototube

: an electron tube having a photoemissive cathode whose released electrons are drawn to the anode by reason of its positive potential

First Known Use of phototube

1930, in the meaning defined above

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The first known use of phototube was in 1930

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Cite this Entry

“Phototube.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/phototube?pronunciation&lang=en_us&dir=p&file=photot11. Accessed 22 November 2019.

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Britannica.com: Encyclopedia article about phototube

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