[ zoh-uh-plangk-tuh n ]
/ ˌzoʊ əˈplæŋk tən /


the aggregate of animal or animallike organisms in plankton, as protozoans.
Compare phytoplankton.

Origin of zooplankton

First recorded in 1900–05; zoo- + plankton
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for zooplankton

/ (ˌzəʊəˈplæŋktən) /


the animal constituent of plankton, which consists mainly of small crustaceans and fish larvaeCompare phytoplankton
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for zooplankton

[ zō′ə-plăngktən ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.