zo·o·plank·ton

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


Origin:
1900–05; zoo- + plankton

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
zooplankton (ˌzəʊəˈplæŋktən) [Click for IPA pronunciation guide]
 
n
Compare phytoplankton the animal constituent of plankton, which consists mainly of small crustaceans and fish larvae

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Zooplankton is always a great word to know.
So is bezoar. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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
Trillions of diatoms, zooplankton, and crustaceans pepper the ice column.
Zooplankton are small animals that are suspended in water and either drift with
  the currents or swim weakly.
To take a specific example, zooplankton feed on phytoplankton, but they are
  eaten by fish that visually track them.
The other student roared off in hot pursuit of zooplankton.
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