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plankton

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plank⋅ton

[plangk-tuhn]
–noun
the aggregate of passively floating, drifting, or somewhat motile organisms occurring in a body of water, primarily comprising microscopic algae and protozoa.

Origin:
1890–95; < G, special use of neut. of Gk planktós drifting, equiv. to plang-, var. s. of plázesthai to drift, roam, wander + -tos verbid suffix


plank⋅ton⋅ic [plangk-ton-ik] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2010.
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plank·ton   (plāngk'tən)   
n.  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.

[German, from Greek, neuter of planktos, wandering, from plazein, to turn aside; see plāk-2 in Indo-European roots.]
plank·ton'ic (-tŏn'ĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

plankton 
1891, from Ger. Plankton (1887), coined by Ger. physiologist Viktor Hensen (1835-1924) from Gk. plankton, neut. of planktos "wandering, drifting," verbal adj. from plazesthai "to wander, drift," from plazein "to drive astray."
Online Etymology Dictionary, © 2001 Douglas Harper
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Science Dictionary
plankton   (plāngk'tən)  Pronunciation Key 
Small organisms that float or drift in great numbers in bodies of salt or fresh water. Plankton is a primary food source for many animals, and consists of bacteria, protozoans, certain algae, cnidarians, tiny crustaceans such as copepods, and many other organisms. Compare benthos, nekton.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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