hadal

9.9

Relating to the deepest parts of the ocean below 6000 meters

adjective
/ˈheɪdəl/

Specialized

: hadal

Biologists discovered a new species of fish living in hadal waters nearly 11,000 meters deep.

Examples

The submersible was built to withstand the immense pressures of the hadal zone.
Scientists are studying the unique organisms found in the hadal trenches of the Pacific Ocean.
The hadal zone is home to unique species of fish.
Many researchers study hadal environments to understand deep-sea ecosystems.
Biologists discovered a new species of fish living in hadal waters nearly 11,000 meters deep.
Scientists are studying the unique organisms found in the hadal trenches of the Pacific Ocean.
The submersible was built to withstand the immense pressures of the hadal zone.

Synonyms

deep-sea

vshadal

13 4.5

Located very far below the sea surface

is limited to the very deepest zones below about 6000 meters

deep-water

vshadal

4 4.9

In very deep parts of the sea

focuses specifically on depths that reach the ocean's lowest zones

deepwater

vshadal

1 3.9

Water that is very deep, usually in oceans or large lakes

is restricted to the absolute deepest ocean parts rather than any deep bodies

How Deep

hadal

Specialized

9.9

abyssal zone

Specialized

9.9

bathyal zone

Specialized

9.9

mesopelagic

Specialized

9.9

tidal zone

Specialized

1 4.2

surface

3.4

Surface Forms

hadal positive

Morphology

hadal = Hades (semi-transparent) = hades + al

Formed from the proper name 'Hades' plus the adjective-forming suffix '-al'; the connection to 'underworld/deep' is figurative and may not be obvious to general learners.

Etymology

Hadal comes from the Greek name Hades, which means 'underworld' or the dark world below the earth. So hadal describes the very deepest parts of the ocean, the deep trenches below about 6000 meters.