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). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
euphotic (juːˈfəʊtɪk, -ˈfɒt-)
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
[C20: from eu- + photic]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
euphotic   (y-fŏt'ĭk)  Pronunciation Key 
See photic.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Of particular interest was a dramatic bloom following the injection of nitrate into the euphotic zone.
Determine the depth of the euphotic zone using a submersible photometer.
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