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Definition of undersea

undersea

/ˌʌn.dɚˈsiː/
un · der · sea
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undersea Lexical Profile

undersea Game Scores & Validity

• adjective

1

Located, occurring, or operating beneath the surface of the sea.

Example

"Engineers laid thousands of miles of undersea fiber-optic cables to connect the continents."

Synonyms
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Antonyms
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• adverb

1

Beneath the surface of the sea; into or under the ocean.

Example

"The remotely operated vehicle traveled deep undersea to map the volcanic trench."

Synonyms
View all synonyms for undersea
Antonyms
View all antonyms for undersea

Word Nuance & Usage

When used as an adverb, 'underseas' is a common variant, whereas 'undersea' is the standard form when used attributively as an adjective before a noun (e.g., 'undersea cables').

• Rhymes for undersea

• Nearby Words

underresourced
underripe
underscore
undersea
undersecretary
undersell
underserved

Cite this Entry

Wordmom. (2026). Definition of Undersea. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/undersea
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