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

At these deep-sea mineral formations, a rich chemical brew, warmed by volcanic activity, spills out over the ocean floor. — Philip Ball, Scientific American, 20 Aug. 2026

The buoyant 808s ping-pong back and forth, sounding like an aquatic marching band ushering in a deep-sea championship team. — Jeff Ihaza, Rolling Stone, 19 Aug. 2026

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

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