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undersea

[uhn-der-see]
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adjective
  1. located, carried on, or used under the surface of the sea: undersea life.
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adverb
  1. underseas.
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Origin of undersea

First recorded in 1605–15; under- + sea
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for undersea

undersea

adjective, adverb Also: underseas (ˌʌndəˈsiːz)
  1. below the surface of the sea
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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

Word Origin and History for undersea

1610s, from under + sea.

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Online Etymology Dictionary, © 2010 Douglas Harper