underwater

adjective

ˌən-dər-ˈwȯ-tər How to pronounce underwater (audio)
Definition of underwaternext
as in aquatic
living, lying, or occurring below the surface of the water underwater plants don't require as much light to grow as surface plants a vessel designed for underwater exploration

Synonyms & Similar Words

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Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of underwater The team collected samples and filmed the plume with an underwater drone to make a three-dimensional map. — Alec Luhn, Scientific American, 20 Oct. 2026 The world’s first demonstration of a subsea geothermal power plant has taken place near an active underwater volcano almost a mile below the ocean surface. — Jeremy Hsu, ArsTechnica, 19 Oct. 2026 Future versions would also feature a broader array of sensors such as underwater sensors and sonar, as well as larger energy-storage systems. — New Atlas, 17 Oct. 2026 The water level of the 90-year-old reservoir has dropped, exposing areas that were previously underwater. — CBS News, 16 Oct. 2026 See All Example Sentences for underwater
Recent Examples of Synonyms for underwater
  1. aquatic
  2. submarine
  3. submerged
Adjective
  • Cade, 45, had never seen an aquatic event at the same scale as Black Yacht Day, despite working in event production.
    — Michael Butler, Miami Herald, 28 Oct. 2026
  • Stumpf said the aquatic mammals were tracked throughout the day and first spotted by boats off the coast of Newport Beach.
    — Andrew J. Campa, Los Angeles Times, 28 Oct. 2026
Definition of aquatic
Adjective
  • The third pillar expands on this approach by increasing the capacity of the wider submarine industrial base.
    — Georgina Jedikovska, Interesting Engineering, 22 Sep. 2026
  • But a new antenna technology, borrowed from the physics of medical implants, is rethinking how submarine machines talk to each other – and to us.
    — Omar Kardoudi June 06, New Atlas, 6 June 2026
Definition of submarine
Adjective
  • Its submerged displacement rises to about 24,000 metric tons.
    — Aamir Khollam, Interesting Engineering, 29 Oct. 2026
  • The discovery was made in the submerged royal harbor of Alexandria, Egypt, and announced this month by the European Institute for Underwater Archaeology.
    — Andrea Margolis, FOXNews.com, 18 Oct. 2026
Definition of submerged

Browse Nearby Words

undervaluing
underwater
under way
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Cite this Entry

“Underwater.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underwater. Accessed 4 Nov. 2026.

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