from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to the part of the oceanic zone into which enough sunlight enters for photosynthesis to take place.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of, pertaining to, or inhabiting the water from the surface of the sea down to 200 metres.
epi- + pelagic (Wiktionary)