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[uhn-der-see] /ˈʌn dərˌsi/
located, carried on, or used under the surface of the sea:
undersea life.
Origin of undersea
1605-15; under- + sea Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for undersea
Contemporary Examples
Historical Examples
  • The best of the German undersea boats, it has been estimated, could not remain under more than three hours at high speed.

    Our Navy in the War Lawrence Perry
  • The undersea reaches lay ahead of him, and the way was clear.

    Under Arctic Ice H.G. Winter
  • Immediately the men in the submarine went to work, and George felt the undersea craft fairly flying through the water.

    The Little Washingtons' Travels Lillian Elizabeth Roy
  • undersea, submarine; underspan, subtend; underslinking, subterfuge.

  • If we approached an undersea cliff I must raise us at once to prevent us being smashed against it.

  • Fields of undersea, the lines faint brown in grass, buried cities.

    Ulysses James Joyce
  • When a mass of bubbles from undersea could provoke such a turmoil in the water that no ship could stay afloat?

    Creatures of the Abyss Murray Leinster
  • This machine will nicely furnish you the power for your undersea liner.

British Dictionary definitions for undersea


adjective, adverb
below the surface of the sea
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for undersea

1610s, from under + sea.

Online Etymology Dictionary, © 2010 Douglas Harper
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