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photic

[foh-tik] /ˈfoʊ tɪk/
adjective
1.
of or pertaining to light.
2.
pertaining to the generation of light by organisms, or their excitation by means of light.
Origin
1835-1845
1835-45; < Greek phōt- (see phot) + -ic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for photic
  • 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.
British Dictionary definitions for photic

photic

/ˈfəʊtɪk/
adjective
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
Word Origin
C19: from photo- + -ic
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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Word Origin and History for photic
adj.

1843, "pertaining to light;" 1899, "pertaining to the parts of the ocean penetrated by sunlight," from Greek phot-, comb. form of Greek phos "light" (related to phainein "to show, to bring to light;" see phantasm) + -ic.

Online Etymology Dictionary, © 2010 Douglas Harper
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photic in Medicine

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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photic in Science
photic
  (fō'tĭk)   
  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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