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Capable of living in a wide range of water depths. Used of an aquatic organism.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Zoology) zoology (of an aquatic organism) able to live at different depths
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
eu•ry•bath•ic(ˌyʊər əˈbæθ ɪk, ˌyɜr-)
of or pertaining to marine or freshwater life that can tolerate a wide range of depths (opposed to stenobathic).
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.