[ploo-stuh n, -ston]

noun Biology.

a buoyant mat of weeds, algae, and associated organisms that floats on or near the surface of a lake, river, or other body of fresh water.

Origin of pleuston

1940–45; pleus- (< Greek pleûs(is) sailing, or pleus- aorist stem of pleîn to sail, go by sea) + -ton, on the model of nekton, plankton
Related formspleus·ton·ic [ploo-ston-ik] /pluˈstɒn ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for pleuston



a mass of small organisms, esp algae, floating at the surface of shallow pools

Word Origin for pleuston

C20: from Greek pleusis sailing, from plein to sail; for form, compare plankton
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