from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various organisms that spend part of their life cycle, usually the larval or egg stages, as plankton.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any organism that spends part of its life-cycle (especially the larval stage) as plankton
from The Century Dictionary and Cyclopedia
- n. The organisms, considered collectively, that pass part of their lives in the depths of the ocean and part at or near the surface.
mero- + plankton (Wiktionary)