photic

[foh-tik]
adjective
1.
of or pertaining to light.
2.
pertaining to the generation of light by organisms, or their excitation by means of light.

Origin:
1835–45; < Greek phōt- (see phot) + -ic

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World English Dictionary
photic (ˈfəʊtɪk)
 
adj
1.  of or concerned with light
2.  biology of or relating to the production of light by organisms
3.  Also: photobathic designating the zone of the sea where photosynthesis takes place
 
[C19: from photo- + -ic]

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

photic pho·tic (fō'tĭk)
adj.

  1. Of or relating to light.

  2. Penetrated by or receiving light.

  3. Designating or relating to the layer of a body of water that is penetrated by sufficient sunlight for photosynthesis.

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
photic   (fō'tĭk)  Pronunciation Key 
  1. Of or relating to light.

  2. Penetrated by or receiving light.

  3. Relating to the layer of a body of water that is penetrated by sufficient sunlight for photosynthesis. The depth of the photic zone is dependent on the clarity of the water and the amount and intensity of direct sunlight, although it does not usually exceed 200 m. Also called euphotic. Compare aphotic.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
There's also the less common photic sneeze, where exposure to a flash of light causes an uncontrollable sneezing fit.
The epipelagic zone is also known as the photic or euphotic zone, and can exist in lakes as well as the ocean.
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