deep sea

noun

The deeper part of the sea or ocean in which no light penetrates.

“deep sea fishing”

OriginMiddle English depe see →
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Meanings

noundeep sea (countable and uncountable, plural deep seas)

plural deep seas

  1. countableuncountableThe deeper part of the sea or ocean in which no light penetrates.
  2. countableuncountablefishingAn open sea. (the part of the sea that is out of sight of land)

    deep sea fishing

Synonyms & antonyms

Also see
ocean depths

Origin

  1. Middle Englishdepe see
  2. Englishdeep sea

From Middle English depe see, equivalent to deep + sea.

More words from Middle English

Full word history & related roots →

Translations

Chinese Mandarin 深海
  • 深海 (shēnhǎi)deeper part of sea
Danish dybhav
  • dybhavdeeper part of sea
Dutch diepzee
  • diepzeedeeper part of sea
Estonian süvameri
  • süvamerideeper part of sea
Finnish syvämeri
  • syvämerideeper part of sea
French abysse
  • abyssedeeper part of sea
German Tiefsee
  • Tiefseedeeper part of sea
Hebrew מְצוּלָה
  • מְצוּלָה (metzulá)deeper part of sea
Hungarian tengermély
  • tengermélydeeper part of sea
Japanese 深海
  • 深海 (shinkai)deeper part of sea
Korean 심해
  • 심해 (simhae)deeper part of sea
Norwegian Bokmål dyphav
  • dyphavdeeper part of sea
Polish głębokie morze
  • głębokie morzedeeper part of sea
Swedish djuphav
  • djuphavdeeper part of sea
Tamil ஆழ்கடல்
  • ஆழ்கடல் (āḻkaṭal)deeper part of sea
Turkish derin deniz
  • derin denizdeeper part of sea
Cite this entry
APA

deep sea. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/deep%20sea

MLA

“deep sea.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/deep%20sea. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “deep sea,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/deep%20sea.

Source: deep sea on Wiktionary, CC BY-SA 4.0.