phototube

[ foh-tuh-toob, -tyoob ]

nounElectronics.
  1. an electron tube with a photosensitive cathode, used like a photocell.

Origin of phototube

1
First recorded in 1925–30; photo- + tube
  • Also called photoelectric tube.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

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

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