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euphotic zone

[yoo-foh-tik]
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noun Oceanography.
  1. the layer of sea water that receives enough sunlight for photosynthesis to occur: it varies greatly with season and latitude, from 0 to 1200 ft. (0–360 m).
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Origin of euphotic zone

First recorded in 1960–65; eu- + photic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018