zooplankton

[zoh-uh-plangk-tuhn]
noun
the aggregate of animal or animallike organisms in plankton, as protozoans.
Compare phytoplankton.


Origin:
1900–05; zoo- + plankton

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
zooplankton (ˌzəʊəˈplæŋktən)
 
n
Compare phytoplankton the animal constituent of plankton, which consists mainly of small crustaceans and fish larvae

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
zooplankton   (zō'ə-plāngk'tən)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The other student roared off in hot pursuit of zooplankton.
The more salmon, the more zooplankton, and the more algae flourish in the lake.
But jellyfish are carnivores, so they depend on the herbivorous zooplankton
  feeding from the algae.
To take a specific example, zooplankton feed on phytoplankton, but they are
  eaten by fish that visually track them.
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