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

In the Mediterranean and Middle East, joint projects with institutions in Egypt, Greece, Saudi Arabia, and Tunisia will focus on ancient civilizations, underwater survey equipment, deep-sea exploration, and heritage preservation. — Rupendra Brahambhatt, Interesting Engineering, 1 Nov. 2026

Few deep-sea species will cause an entire research vessel’s crew to rush into the control room to catch a glimpse—but the barreleye fish (Macropinna microstoma) is one of them. — Andrew Paul, Popular Science, 29 Oct. 2026

Subsea cable projects owned by US companies such as Google and Meta face some of the greatest risks from the threat of deep-sea sabotage in the Pacific Ocean, according to a new report. — Jeremy Hsu, ArsTechnica, 28 Oct. 2026

The first deep-sea scientist from the Seychelles dives below the surface of the Indian Ocean. — Tanya Fedak, Variety, 22 Oct. 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