deep-sea

adjective

ˈdēp-ˈsē 

: of, relating to, or occurring in the deeper parts of the sea

deep-sea fishing

Synonyms of deep-sea

• oceanic

Examples of deep-sea in a Sentence

chartered a boat to do some deep-sea fishing

Recent Examples on the Web

After a Soviet ballistic missile submarine sank in the Pacific Ocean in 1968, the CIA secretly built the Hughes Glomar Explorer, disguised as a deep-sea mining vessel, to recover the wreck from nearly 5,000 meters (16,500 feet) below the surface. — Kaif Shaikh, Interesting Engineering, 6 Aug. 2026

The tests demonstrate the underlying sensing and healing mechanisms, not a finished skin ready to spend years clinging to a deep-sea robot. — New Atlas, 4 Aug. 2026

Guest adventures can be tailored to nighttime fishing, wintertime Wahoo trolling, or full-moon deep-sea excursions. — Kelsey Glennon, Southern Living, 3 Aug. 2026

The paper eliminates a popular theory as to why insects can’t live in oceans—namely that their respiratory systems would implode under deep-sea pressure. — Mary Randolph, Scientific American, 23 July 2026

Word History

First Known Use

circa 1625, in the meaning defined above

Rhymes for deep-sea

• agree
• allee
• banshee
• beastly
• bibi
• bowsprit
• carefree
• cerci
• chablis
• cowpea
• crappie
• crappy

Kids Definition

deep-sea

adjective

ˌdēp-ˌsē

: of, relating to, or occurring in the deeper parts of the sea

deep-sea fishing