n. Free-floating small protozoa, crustaceans (such as krill), etc. and the eggs and larvae from larger animals.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. animal constituent of plankton; mainly small crustaceans and fish larvae
Word Usage
"One of the model's key assumptions was that bluefin like to spawn in waters full of organisms called zooplankton — waters that satellite data suggest were hit particularly hard by the spill."