ha·​dal ˈhā-dᵊl How to pronounce hadal (audio)
: 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 Beyond a certain depth, specifically below about 200 meters (656 feet), the ocean enters the mesopelagic zone and extends into the abyssal and hadal zones, reaching depths of over 11,000 meters (36,000 feet). Scott Travers, Forbes, 28 Feb. 2024 Below that, only one destination more mysterious and more feared: Hades, or the hadal zone, below 20,000 feet. Carl Hoffman, Washington Post, 1 Aug. 2023 The regions that exceed roughly 3.5 miles, or 20,000 feet, are known as the hadal zone, named after Hades, Greek god of the underworld. Tree Meinch, Discover Magazine, 27 June 2023 The deepest part of the world's oceans, the Mariana Trench, is about 36,070 feet, nearly seven miles deep, in the hadal zone, according to NOAA. Caitlin O'Kane, CBS News, 23 June 2023 In studies, more than half of sampled hadal organisms—those living in the deepest parts of the ocean, beyond 20,000 feet—had plastics in their gut. Timothy Shank, Scientific American, 1 Aug. 2022 No other system could so precisely map hadal depths. Ben Taub, The New Yorker, 10 May 2020 Life at the extremes Welcome to the hadal zone: the deepest part of the ocean. Eva Botkin-Kowacki, The Christian Science Monitor, 23 Aug. 2019

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'hadal.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


French, from Hadès Hades

First Known Use

1959, in the meaning defined above

Time Traveler
The first known use of hadal was in 1959

Dictionary Entries Near hadal

Cite this Entry

“Hadal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hadal. Accessed 12 Apr. 2024.

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