hadal

adjective

ha·​dal ˈhā-dᵊl 

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

Examples of hadal in a Sentence

Recent Examples on the Web

The creatures live 5,800 to 9,500 meters (19,000 to 30,000 feet) below the ocean’s surface in what’s called the hadal zone. — Katie Hunt, CNN Money, 29 Dec. 2025

Studies suggest hadal zones can bury up to 70 times more carbon per square meter than the average seafloor. — Ingmar Rentzhog, Forbes.com, 14 Aug. 2025

What to Know About the Project The three-year research initiative will focus on deep-sea areas in the Pacific Ocean, including parts of the hadal zone, which extends to depths of 36,000 feet and accounts for 45 percent of the ocean. — Justin Gest, Newsweek, 20 Jan. 2025

Word History

Etymology

French, from Hadès Hades

First Known Use

1959, in the meaning defined above

Rhymes for hadal

• paddle
• saddle
• straddle