hadal

[heyd-l]

adjective

Oceanography.

1. of or relating to the greatest ocean depths, below approximately 20,000 feet (6,500 meters).

2. of or relating to the biogeographic region of the ocean bottom below the abyssal zone.

hadal

/ ˈheɪdəl /

adjective

1. of, relating to, or constituting the zones of the oceans deeper than abyssal: below about 6000 metres (18 000 ft) See also abyssal

hadal

1. Relating to the deepest regions of the ocean, below about 6,000 m (19,680 ft). The hadal zone mostly comprises trenches that can reach depths greater than 10,000 m (32,800 ft).

Word History and Origins

Origin of hadal¹

First recorded in 1955–60; Had(es) + -al ¹

Word History and Origins

Origin of hadal¹

C20: from French, from Hadés _Hades