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hadal

[ heyd-l ]

adjective

, Oceanography.
  1. of or relating to the greatest ocean depths, below approximately 20,000 feet (6,500 meters).
  2. of or relating to the biogeographic region of the ocean bottom below the abyssal zone.


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
“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


hadal

/ hādl /

  1. 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).


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Word History and Origins

Origin of hadal1

First recorded in 1955–60; Had(es) + -al 1
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Word History and Origins

Origin of hadal1

C20: from French, from Hadés Hades
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Example Sentences

They can operate autonomously, which they’ll do at the hadal depths, but can also work while connected to a tether.

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