located, carried on, or used under the surface of the sea:
undersea life.
adjective, adverb
below the surface of the sea


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  • Underseas

    adverb 1. beneath the surface of the sea.

  • Undersecretariat

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  • Under-secretary

    or undersecretary noun, (often initial capital letters) 1. an official who is subordinate to a principal secretary, as in the U.S. cabinet: Under Secretary of the Treasury.
