hadalEnglishOxford New American Dictionaryhadal /ˈhādl, ˈheɪdl / ▸ adjective relating to the zone of the sea greater than approximately 20,000 feet (6,000 m) in depth (chiefly oceanic trenches). – ORIGIN 1950s : from Hades + -al.
EnglishOxford New American DictionaryEnglishOxford New American Dictionary
