deep sea

== English == === Etymology === From Middle English depe see, equivalent to deep +‎ sea. === Pronunciation === === Noun === deep sea (countable and uncountable, plural deep seas) The deeper part of the sea or ocean in which no light penetrates. (fishing) An open sea. (the part of the sea that is out of sight of land) deep sea fishing ==== Derived terms ==== ==== Related terms ==== ==== Translations ==== === See also === === Further reading === deep sea on Wikipedia.Wikipedia