aphotic

[ey-foh-tik]
adjective
lightless; dark.

Origin:
1900–05; a-6 + photic

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
aphotic (əˈfɒtɪk)
 
adj
1.  characterized by or growing in the absence of light: an aphotic plant
2.  of or relating to the zone of an ocean below that to which sunlight can penetrate, usually about 90m (300 ft). This is the lowest level at which photosynthesis can take place
 
[C20: from a-1 + -photic, from Greek phōs light]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

aphotic
"untouched by sunlight, lightless" (in ref. to deep-sea regions), 1903, Mod.L., from Gk. a- "not, without" + phos (gen. photos) "light," related to phainein "to show, to bring to light" (see phantasm). Aphotic zone is recorded from 1913.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
aphotic   (ā-fō'tĭk)  Pronunciation Key 
  1. Having no light.

  2. Relating to the region of a body of water that is not reached by sunlight and in which photosynthesis is unable to occur. Compare photic.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They are particularly curious about animals with large eyes that live on the bottom of the seafloor in the aphotic zone.
Below this, in the aphotic zone, the available light is too weak to support a significant amount of photosynthetic production.
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