of, pertaining to, in, or associated with the deeper parts of the sea: deep-sea fishing; deep-sea diver.

1620–30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
(modifier) of, found in, or characteristic of the deep parts of the sea: deep-sea fishing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Because many deep-sea creatures make their own light, there is still a need for
  disguise in the dark deep.
Examines the relationship between the form of deep-sea creatures and the
  ecology of the ocean floor.
The invention of telegraphy indirectly brought about a great advance in our
  knowledge of deep-sea fauna.
Other sources of income are pearl farming and deep-sea commercial fishing.
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