subsea

adjective sub·sea \ ˌsəb-ˈsē \
variants: or less commonly sub-sea

Definition of subsea

1 : 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
2 : existing or occurring under the seafloor
  • subsea oil wells

First Known Use of subsea

1817

in the meaning defined above

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