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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.]


(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]


(ˈheɪd l)

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]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.hadal - relating to the deepest parts of the ocean (below 6000 meters)
References in periodicals archive ?
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.
This contrasts with the conventional idea that the hadal zone has been isolated for a long time and thus has unique water characteristics.
The main purpose of this paper is to further advance geochemical studies in the hadal zone by using time-series observations and the first measurement of [sup.
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.
The hadal zone is the name given to the deepest depths of the ocean, named after hades as the underworld god of Greek mythology.
It lies in the hadal zone beyond the abyssal zone, and plunges down to a water depth of around 11 kilometers.
The hadal zone extends from around six kilometers to the deepest seafloor.
13 The hadal zone is a termused for the lowest part of what?
It does not stop until it reaches the bottom of the Hadal Zone, 11 kilometres below the surface.
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.
Since the retirement of the Trieste and the French bathyscaphe Archimede in the early 1960s, no nation has had the capability to dive much below 10,000 feet (6000 meters) into the unexplored hadal zone, located pormarily in the deep canyons winding around the Pacific Rim and into the Indian Ocean and the Caribbean Sea.
The prints represent both scientific data, rarely seen images of geothermal activity in the abyssal and hadal zones, and formal compositions, elegant black-and-white abstractions.