sub·​sea ˌsəb-ˈsē How to pronounce subsea (audio)
variants or less commonly sub-sea
: existing or occurring below the surface of the sea
subsea currents
The island, an upthrust of volcanic rock, lies along the Norfolk Ridge, an 1,100-mile line of subsea mountains.Michael Davie
: existing or occurring under the seafloor
subsea oil wells

Word History

First Known Use

1817, in the meaning defined at sense 1

Time Traveler
The first known use of subsea was in 1817

Dictionary Entries Near subsea

Cite this Entry

“Subsea.” Dictionary, Merriam-Webster, Accessed 20 May. 2024.

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