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Of or relating to the deepest regions of the ocean, below about 6,000 meters (20,000 feet).
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.
(Physical Geography) of, relating to, or constituting the zones of the oceans deeper than abyssal: below about 6000 metres (18 000 ft). See also abyssal
[C20: from French, from Hadés Hades]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
of or pertaining to the biogeographic region of the ocean bottom below the abyssal zone, or from approximately 20,000 ft. (6500 m) to the greatest ocean depths.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
|Adj.||1.||hadal - relating to the deepest parts of the ocean (below 6000 meters)|
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