undersea

CEFRB2

/ˌʌndəˈrsi/

adjective

Türkçe translations

Translating…

In plain English

01
adjective
Existing or happening below the surface of the sea.
02
adjective
Extra detail
Existing, relating to, or made for use beneath the sea.

Examples

A tsunami is a series of waves caused by earthquakes or undersea volcanic eruptions.
The bathysphere is a new technology for undersea travel.

At a glance

Sits at B2 on the CEFR scale

Deep Dive

In context

"You're right!" she cried. "I'm sure you are." Twenty reasons come back. An undersea tunnel to the little island.
It is not known just what action will be taken against the captain of the undersea boat.
The Channel Tunnel is the longest undersea tunnel in the world, with this section being 38km (23.6 miles) long.

Two questions on this entry. Nothing is scored.

Question 1 · Quick check

Practise this properly in the app, where the word comes back before you forget it.

The word in print, with each source given in full.

It is not known just what action will be taken against the captain of the undersea boat.
1920, George M. Battey, Jr., 70, 000 Miles on a Submarine Destroyer, Webb & Vary Company, page 133
"You're right!" she cried. "I'm sure you are." Twenty reasons come back. An undersea tunnel to the little island.
1923, The Saturday Evening Post, G. Graham, page 58
The Sediment (SNAP-7E) Density Meter (an underwater rocket) has been developed to investigate to an ocean-bottom depth of 11 sedimentary feet. Sea Lab I, the Navy’s new undersea laboratory, complete with observation porch and garage, should become safe to operate at the 200 foot level.
1966, Robert B. Thomas, The Old Farmer's Almanc, Yankee Pub, page 44
The bull kelp forests off Northern California are sometimes spoken of as the redwoods of the sea. And like the redwoods, these forests are in danger. In less than a decade, these otherworldly undersea landscapes, lush with life, have all but disappeared along 200 miles of coast north of San Francisco's Golden Gate Bridge.
2022 April 30, David Helvarg, “Climate change threatens another California forest, this one underwater”, in The New York Times, New York, N.Y.: The New York Times Company, →ISSN, →OCLC, archived from the original on 17 Aug 2025
The Channel Tunnel is the longest undersea tunnel in the world, with this section being 38km (23.6 miles) long.
2022 December 28, “The essential Eurotunnel”, in RAIL, number 973, page 59

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From under- + sea.