noun Physiology, Biology.
a receptor stimulated by light.

1905–10; photo- + receptor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
photoreceptor (ˌfəʊtəʊrɪˈsɛptə)
zoology, physiol a light-sensitive cell or organ that conveys impulses through the sensory neuron connected to it

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

photoreceptor pho·to·re·cep·tor (fō'tō-rĭ-sěp'tər)
A nerve ending, cell, or group of cells specialized to sense or receive light.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
photoreceptor   (fō'tō-rĭ-sěp'tər)  Pronunciation Key 
  1. A specialized structure or cell that is sensitive to light. In vertebrate animals, the photoreceptors are the rods and cones of the eye's retina. See Note at circadian rhythm.

  2. An electronic device that converts light energy into electrical signals. Photoreceptors are used in photocopy and facsimile machines, cameras, and solar cells.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Millions of photoreceptor cells residing in the human retina gather light and
  transmit signals to the brain.
Through the same viral strategy, both photoreceptor types were then introduced
  into neurons.
Retinal implants are designed to replace the function of damaged light-sensing
  photoreceptor cells in the retina.
First, the pigment cell absorbs light and casts a shadow over the photoreceptor
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