hadal

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ha·dal

 (hād′l)
adj.
Of or relating to the deepest regions of the ocean, below about 6,000 meters (20,000 feet).

[French, from Hadès, Hades, from Greek Haidēs; see weid- in Indo-European roots.]
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.

hadal

(ˈheɪdəl)
adj
(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

ha•dal

(ˈheɪd l)

adj.
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.
[1955–60; Had (es) + -al1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.hadal - relating to the deepest parts of the ocean (below 6000 meters)
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
hadal
References in periodicals archive ?
The test on Earth is necessary to prepare the vehicle to its intended purpose and WHOI's sees the hadal zone as the best Europa simulation for its future alien-hunting mission.
The hadal zone below a depth of ~6000 m is regarded as one of the last frontiers of oceanography, as its inaccessibility has severely restricted scientific investigation (e.g., ref.
A team of researchers from Newcastle University in the UK decided to study the hadal zone, an area of water that is 3.7 miles to 6.8 miles below the surface.
Dual boilers, PIDs, and welds that could survive a trip through the hadal zone put the cost of a good home machine at a minimum of $ 1,000.
Liparid and macrourid fishes of the hadal zone: in situ observations of activity and feeding behaviour.
The trip to the floor of the Marianas Trench took them from the sunlit world to the ebony-black abyss of the "hadal zone," beginning at approximately 20,000 feet.
It lies in the hadal zone beyond the abyssal zone, and plunges down to a water depth of around 11 kilometers.
13 The hadal zone is a termused for the lowest part of what?
(5) HADAL ZONE: Such extreme depths are mostly found in deep-water trenches and canyons.
The hadal zone consists of the deepest ocean trenches.
When asked about the safety of sending people into the hadal zone -- the Hades zone, or depths greater than 6,000 m -- Hawkes replies, "the only sure way to be safe is to be dead....