noun Electronics.
a photosensitive semiconductor diode.

1940–45; photo- + diode Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
photodiode (ˌfəʊtəʊˈdaɪəʊd)
a semiconductor diode, the conductivity of which is controlled by incident illumination

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
photodiode   (fō'tō-dī'ōd')  Pronunciation Key 
A diode that exhibits sensitivity to light, either by varying its electrical resistance like a photoresistor, or generating a electric potential in the manner of a photoelectric cell. See more at photoelectric.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
That's slow enough to be measured by a photodiode and translated by standard electronics into seconds, minutes, and hours.
Inside the measuring instrument, a light-emitting diode shines on the film, and a photodiode records the fluctuating fluorescence.
Changing the photodiode collector-to-electrode area ratio can control the current density available at each individual photodiode.
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