pho·to·re·cep·tor

[foh-toh-ri-sep-ter]
noun Physiology, Biology.
a receptor stimulated by light.

Origin:
1905–10; photo- + receptor

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
photoreceptor (ˌfəʊtəʊrɪˈsɛptə) [Click for IPA pronunciation guide]
 
n
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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00:10
Photoreceptor is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
American Heritage
Medical Dictionary

photoreceptor pho·to·re·cep·tor (fō'tō-rĭ-sěp'tər)
n.
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
Some scientists are trying to inject signaling molecules into the eye to
  stimulate light-collecting photoreceptor cells to regrow.
Through the same viral strategy, both photoreceptor types were then introduced
  into neurons.
Scanning the eyes of dogs that underwent the procedure, researchers could see
  how the photoreceptor cells had changed.
First, the pigment cell absorbs light and casts a shadow over the photoreceptor
  cell.
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