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phototransistor

[foh-toh-tran-zis-ter] /ˌfoʊ toʊ trænˈzɪs tər/
noun, Electronics.
1.
a transistor that amplifies current induced by photoconductivity.
Origin
1945-1950
1945-50; photo- + transistor
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for photo transistor

phototransistor

/ˌfəʊtəʊtrænˈzɪstə/
noun
1.
a junction transistor, whose base signal is generated by illumination of the base. The emitter current, and hence collector current, increases with the intensity of the light
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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photo transistor in Science
phototransistor
  (fō'tō-trān-zĭs'tər)   
A transistor that regulates current or switches it on and off based on the intensity of the light it is exposed to rather than an external electric signal. Phototransistors are used in many electric-eye applications, including digital cameras, in which millions of tiny phototransistors map an image into an array of electrical signals. See also photoelectric effect.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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