Synonyms

deep-sea

American

[deep-see] / ˈdipˈsi /

adjective

of, pertaining to, in, or associated with the deeper parts of the sea.

deep-sea fishing; deep-sea diver.

deep-sea British

noun

(modifier) of, found in, or characteristic of the deep parts of the sea

deep-sea fishing

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of deep-sea

First recorded in 1620–30

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

To investigate further, Koll and Prof. Anton Wallner studied additional geological samples in recent years, including deep sea sediments up to 30,000 years old.

From Science Daily • May 14, 2026

In addition, they are prevalent throughout the environment — in alpine snow, deep sea sediment and drinking water.

From Los Angeles Times • Apr. 2, 2026

Also in Dubai, debris from an "aerial interception" caused a fire in a berth at the Jebel Ali deep sea port - the world's ninth busiest.

From BBC • Mar. 1, 2026

"Our Earth, our sea, is mostly deep sea," Pipit said.

From Barron's • Jan. 26, 2026

The deep sea breaking miles away on the reef made an undertone less perceptible than the susurration of the blood.

From "Lord of the Flies" by William Golding

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023