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phototube definition

photo·tube (fōt′ō to̵̅o̅b′, -tyo̵̅o̅b′)

noun

a vacuum tube designed to convert light energy into electrical energy by means of a photoemissive cathode

Etymology: photo(electric) + tube

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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