euphotic

[yoo-foh-tik]

eu·pho·tic

[yoo-foh-tik]
adjective
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).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Euphotic is always a great word to know.
So is quincunx. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
euphotic (juːˈfəʊtɪk, -ˈfɒt-)
 
adj
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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