from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. 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
- adj. Describing that part of the near-surface ocean in which photosynthesis is possible
eu- + photic (Wiktionary)