from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plankton normally living in the top hundred fathoms of a body of water (at a depth of about 180 metres or less).
from The Century Dictionary and Cyclopedia
- n. The animals and plants which float or swim at the surface or above the hundred-fathom line, considered collectively and in contrast with the dwellers in deeper water; the pelagic plankton (which see, under plankton).
epi- + plankton (Wiktionary)