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Macroscopic organisms that float or swim on the surface of a body of water.
pleus·ton′ic (plo͞o-stŏn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Biology) a mass of small organisms, esp algae, floating at the surface of shallow pools
[C20: from Greek pleusis sailing, from plein to sail; for form, compare plankton]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
pleus•ton(ˈplu stən, -stɒn)
a buoyant mat of weeds, algae, and associated organisms that floats on or near the surface of a body of fresh water.
[1940–45; pleus- (< Greek pleûs(is) sailing]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.