Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. of, or relating to the deepest parts of the ocean

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. relating to the deepest parts of the ocean (below 6000 meters)

Etymologies

French, from Hadès, Hades, from Greek Haidēs; see weid- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French hadal, from Hadès + -al. (Wiktionary)

Examples

  • Below six thousand meters lies a region known as the hadal zone (a term coined only in 1959 from the French Hadès); in the Marianas Trench off the Philippines it is 11,000 meters deep.

    Where Wonders Await Us

  • And the hadal prisoner pointed at one I had drawn on my face.

    Deeper

  • At its height nine thousand years ago, the hadal empire had been a sort of dark paradise.

    Deeper

  • Then, suddenly, the hadal tribes had nowhere left to go.

    Deeper

  • They would have some hadal artifact for her to translate.

    Deeper

  • And how else did you explain the presence of the same recurring glyphs and images and spirals carved in the walls leading to the most impressive buildings in each hadal city?

    Deeper

  • At the edge of her hearing, she could almost distinguish soft syllables and bits of hadal click language.

    Deeper

  • In a sense, that incident had closed the book on hadal civilization.

    Deeper

  • He talked about doing a documentary, but I figured he was just another pirate looking for hadal gold.

    Deeper

  • Your plague wiped out all their generations, the last of their memory, every last one of the hadal nations.

    Deeper

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