Definition of deep-seanext
as in oceanic
of, relating to, or occurring in the open sea chartered a boat to do some deep-sea fishing

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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 deep-sea Another species, Eperopeus vermiculatus, was named in honor of the World Register of Marine Species — a quiet nod to the infrastructure that makes cataloging deep-sea biodiversity possible in the first place. Hanna Wickes, Charlotte Observer, 26 Mar. 2026 The Names Tell Their Own Stories The naming conventions reveal a human side to deep-sea taxonomy. Hanna Wickes, Miami Herald, 26 Mar. 2026 The long-term effects of nodule mining on deep-sea biodiversity are unknown—like so much of the deep ocean and its fertile benthic ecosystems, whose mysteries scientists are only beginning to unravel. Philip Sherburne, Pitchfork, 16 Mar. 2026 With growing interest globally in deep-sea mining, the International Seabed Authority (ISA) is developing rules for how countries lease and commercially mine international waters. Lauren Sommer, NPR, 13 Mar. 2026 See All Example Sentences for deep-sea
Recent Examples of Synonyms for deep-sea
oceanic
Adjective
  • Students are schooled in the oceanic environment, first aid, CPR, mutual cooperation, competition techniques and lifesaving methods.
    Jessie Dax-Setkus, Oc Register, 22 Mar. 2026
  • These hot springs form where water rises through the oceanic crust at high temperatures, up to about 750 degrees Fahrenheit (400 degrees Celsius).
    Leonardo Macelloni, The Conversation, 10 Mar. 2026

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Cite this Entry

“Deep-sea.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/deep-sea. Accessed 31 Mar. 2026.

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