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photic zone

American  

noun

Biology.
  1. the upper layer of a body of water delineated by the depth to which enough sunlight can penetrate to permit photosynthesis.


Etymology

Origin of photic zone

First recorded in 1970–75

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Footage from remotely operated submersibles exploring seafloors far below the photic zone revealed that microbial mats can develop there as well, but they are produced by chemosynthetic bacteria.

From Science Daily • Mar. 8, 2026

The region starts about 1,000 feet down — just beneath the photic zone, which gets enough sunlight to support photosynthesis and most of the sea’s plants — and descends for miles.

From New York Times • May 30, 2024

The majority of the ocean includes the photic zone.

From Textbooks • Jun. 9, 2022

Below the photic zone is the dark aphotic zone, where photosynthesis cannot occur.

From Textbooks • Jan. 1, 2018

Photosynthesis can occur in the sunlit region near the surface called the photic zone.

From Textbooks • Jan. 1, 2018

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