adjective ha·dal \ˈhā-dəl\

Definition of hadal

  1. :  of, relating to, or being the parts of the ocean below 6000 meters (about 20,000 feet)

Origin and Etymology of hadal

French, from Hadès Hades

First Known Use: 1959

Seen and Heard

What made you want to look up hadal? Please tell us where you read or heard it (including the quote, if possible).