un·der·sea

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

Origin:
1605–15; under- + sea

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
undersea (ˈʌndəˌsiː) [Click for IPA pronunciation guide]
 
adj, —adv
below the surface of the sea

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Undersea is always a great word to know.
So is ort. Does it mean:
a gadget; dingus; thingumbob.
a scrap or morsel of food left at a meal.
Example sentences
But it would also have outlets that could divert that flow, if need be, into
  undersea piping.
Tsunamis are large ocean waves caused by undersea earthquakes or landslides.
Methane naturally escapes from these deposits, as well as from undersea vents
  and natural oil or gas seeps.
Once the marvel of the telecom world, the first undersea fiber optic cables
  have reached the point of telecom obsolescence.
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