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Definition of plankton


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plank·ton  audio  (plngktn) KEY  

NOUN:
The collection of small or microscopic organisms, including algae and protozoans, that float or drift in great numbers in fresh or salt water, especially at or near the surface, and serve as food for fish and other larger organisms.

ETYMOLOGY:
German, from Greek, neuter of planktos, wandering, from plazein, to turn aside; see plk- 2 in Indo-European roots

OTHER FORMS:
plank·tonic   (-tnk) KEY  (Adjective)


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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
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