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the aggregate of animal or animallike organisms in , as protozoans.
the animal constituent of plankton, which consists mainly of small crustaceans and fish larvae Compare phytoplankton

1901, from comb. form of Greek zoion “animal” (see zoo) + plankton.
Plankton that consists of tiny animals, such as rotifers, copepods, and krill, and of microorganisms once classified as animals, such as dinoflagellates and other protozoans.


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