undersea

1 of 2

adjective

un·​der·​sea ˌən-dər-ˈsē 

1

: being or carried on under the sea or under the surface of the sea

undersea oil deposits

undersea fighting

2

: designed for use under the surface of the sea

an undersea fleet

undersea

2 of 2

adverb

variants or underseas

ˌən-dər-ˈsēz 

: under the sea : beneath the surface of the sea

photographs taken undersea

Examples of undersea in a Sentence

Adjective

They are conducting undersea research.

Recent Examples on the Web

Adjective

That and Titan's unusual design subjected it to scrutiny in the undersea exploration community. —CBS News, 26 Sep. 2024

A number of factors are breaking down Titanic, including undersea currents, corrosive salt water and a microbe, a metal-hungry bacterium. —George Petras, USA TODAY, 21 Sep. 2024

The second paleoclimate project extracted sediment cores from undersea peaks to chart how far seaward Thwaites extended in recent centuries. —Bypaul Voosen, science.org, 19 Sep. 2024

The Titan imploded on June 18, 2023, killing all five on board and setting off a worldwide debate about the future of private undersea exploration. —Patrick Whittle, Fortune, 16 Sep. 2024

Word History

First Known Use

Adjective

1613, in the meaning defined at sense 1

Adverb

1645, in the meaning defined above

Kids Definition

undersea

adjective

un·​der·​sea

ˈən-dər-ˈsē

1

: being or carried on under the sea or under the surface of the sea

undersea oil deposits

undersea warfare

2

: designed for use under the surface of the sea

undersea fleet