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phototube

[foh-tuh-toob, -tyoob] /ˈfoʊ təˌtub, -ˌtyub/
noun, Electronics.
1.
an electron tube with a photosensitive cathode, used like a photocell.
Also called photoelectric tube.
Origin of phototube
1925-1930
First recorded in 1925-30; photo- + tube
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for phototube

phototube

/ˈfəʊtəʊˌtjuːb/
noun
1.
a type of photocell in which radiation falling on a photocathode causes electrons to flow to an anode and thus produce an electric current
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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