[ploo-stuhn, -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.

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

pleustonic [ploo-ston-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pleuston (ˈpluːstən, -stɒn)
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]

pleustonic (pluːˈstɒnɪk)
1.  of or relating to pleuston
2.  denoting a marine organism held at the surface of the water by a float, such as the Portuguese man-of-war

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