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euphotic

[yoo-foh-tik]
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adjective
  1. noting or pertaining to the layer or zone of sea water that receives enough sunlight for photosynthesis to occur, varying greatly with season and latitude, from 0 to 1200 feet (0–360 meters).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for euphotic

euphotic

adjective
  1. ecology denoting or relating to the uppermost part of a sea or lake down to about 100 metres depth, which receives enough light to enable photosynthesis to take place
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Word Origin

C20: from eu- + photic
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

euphotic in Science

euphotic

[yōō-fŏtĭk]
  1. See photic.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.