Etymology
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deep-sea (adj.)

"of or pertaining to the deeper parts of the ocean," 1620s, from deep (adj.) + sea.

updated on July 09, 2018

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Definitions of deep-sea from WordNet

deep-sea (adj.)
of or taking place in the deeper parts of the sea;
deep-sea exploration
deep-sea fishing
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.