Definition of hadal in English:

Share this entry


Pronunciation: /ˈhādl/


Relating to the zone of the sea greater than approximately 20,000 feet (6,000 m) in depth (chiefly oceanic trenches).
Example sentences
  • The hadal environment (water depths greater than 6000m) is one of the last habitats on earth to be impacted by unsustainable human activity.
  • Submarine trenches usually develop downward from depths around 6,000 m, the beginning of the hadal region, exclusive domain of highly specialized and exquisite molluscan communities.
  • The hadal zone makes up only 1 or 2 percent of the ocean and is located in narrow oceanic trenches.


Mid 20th century: from Hades + -al.

For editors and proofreaders

Syllabification: ha·dal

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.