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photic

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

1835–45; < Greek phōt- (see phot) + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for photic

Historical Examples

  • The after-effects of photic and mechanical stimulation are similar.

    Life Movements in Plants, Volume II, 1919

    Sir Jagadis Chunder Bose

  • In these cases the photic stimulus produces partly chemical and partly mechanical changes.

    The Wonders of Life

    Ernst Haeckel

  • As might well be supposed, this work with the "photic borer," as Clewe now called his instrument, was of absorbing interest.

    The Great Stone of Sardis

    Frank R. Stockton

  • The screen was set up as it had been in the other building, and everything was made ready for the operations of the photic borer.

    The Great Stone of Sardis

    Frank R. Stockton

  • The latent period of photic reaction is shortened with the increasing intensity of light.


British Dictionary definitions for photic

photic

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
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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

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

photic in Medicine

photic

(fōtĭk)
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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

photic in Science

photic

[fōtĭk]
  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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.