deep sea

noun

Pronunciation: /diːp siː/

Definition

The lowest layer of the ocean, existing below the photic zone where light is insufficient for photosynthesis.

Examples

• Many creatures in the deep sea have evolved bioluminescence to attract prey in the total darkness.

• Scientists are still discovering new species living in the extreme conditions of the deep sea.

• Exploration of the deep sea remains one of the most challenging frontiers for modern oceanography.

Synonyms of deep sea

Words with a similar meaning to deep sea:

• abyss
• ocean floor
• pelagic zone

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