| Front | hadal \HAYD-l\ |
|---|---|
| Back | adjective Of or relating to the deepest regions of the ocean, below about 6,000 meters (20,000 feet). [French, from Hades, from Greek Haides, the god of the netherworld and dispenser of earthly riches, his netherworld kingdom, the abode of the shades of the dead.] "The bottoms beneath the high seas at depths of about 6,000 to 18,000 feet (1,800-5,500 meters) are referred to as the abyssal region. These regions are characterized by a temperature that seldom exceeds 4 deg. C. A second term, the hadal region, is used in connection with the still-deeper waters of the oceanic trenches." - Jack Pearce, Marine Biology, Colliers Encyclopedia CD-ROM, 28 Feb 1996. |
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