undersea
adjective/ˈʌndərˌsiː/
Frequency rank: #14,955 of 20,003 in the WORDED list (wordfreq data)
Meaning
existing, carried out, or used beneath the surface of the sea.

Example sentence
Scientists launched a major undersea exploration to study creatures living near hydrothermal vents.
Synonyms & related words
- underwater
- submarine
- subaquatic
- oceanic
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