The meaning of UNDERSEA is being or carried on under the sea or under the surface of the sea. How to use undersea in a sentence.

Included in the scope of undersea exploration are the physical and chemical properties of seawater, all manner of life in the sea, and the geological and geophysical features of the Earth’s crust.

There is the undersea mineral war waged by those who are trying rapidly to exploit the resources of the sea bed. We are only just beginning to address ourselves to the extraction of undersea resources. …

Feb 3, 2026 · undersea /ˈʌndərˌsi/ IPA guide Definitions of undersea adjective beneath the surface of the sea synonyms: submarine

Discover everything about the word "UNDERSEA" in English: meanings, translations, synonyms, pronunciations, examples, and grammar insights - all in one comprehensive guide.

Existing or used beneath the surface of the sea: undersea life; undersea cameras.

Definition of undersea adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Undersea refers to a location beneath or on the bottom of the sea or ocean. It relates to something that operates, exists, or takes place below the surface of the sea.

Pronunciation Audio (US): 0:02 Adjective undersea (not comparable) Existing, relating to, or made for use beneath the sea. Synonyms: subsea, submarine

Undersea definition: Existing or used beneath the surface of the sea.