hadal \HEYD-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.
Here a once-living being found the hadal current which twists in the waters of all rivers.
-- Lawrence Norfolk, "The Shape of a Boar," 2000
By which I mean, if the earth itself were shrunk to the size of a lemon, the black hadal depths of even the Marianas Trench would be shallower than that moist breath of yours gathered on the lemon's skin.
-- Brad Leithauser, "The Friends of Freeland," 1997
Hadal entered English in the mid-1900s, and comes from the name Hades, the Greek god of the underworld.
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