Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of, relating to, or being the uppermost layer of a body of water that receives sufficient light for photosynthesis and the growth of green plants.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Describing that part of the near-surface ocean in which photosynthesis is possible

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

eu- +‎ photic

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