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hadal

[heyd-l] /ˈheɪd l/
adjective
1.
of or pertaining to the greatest ocean depths, below approximately 20,000 feet (6500 meters).
2.
of or pertaining to the biogeographic region of the ocean bottom below the abyssal zone.
Origin
1955-1960
1955-60; Had(es) + -al1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for hadal
  • The floodlight that bathed him was the first real light ever to enter this hadal realm.
British Dictionary definitions for hadal

hadal

/ˈheɪdəl/
adjective
1.
of, relating to, or constituting the zones of the oceans deeper than abyssal: below about 6000 metres (18 000 ft) See also abyssal
Word Origin
C20: from French, from HadésHades
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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hadal in Science
hadal
  (hād'l)   
Relating to the deepest regions of the ocean, below about 6,000 m (19,680 ft). The hadal zone mostly comprises trenches that can reach depths greater than 10,000 m (32,800 ft).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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