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WordReference Random House Unabridged Dictionary of American English © 2024pleus•ton (plo̅o̅′stən, -ston),USA pronunciation n. [Biol.]- Plant Biology, Ecologya 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.
- Greek pleûs(is) sailing, or pleus- aorist stem of pleîn to sail, go by sea) + -ton, on the model of nekton, plankton
- 1940–45; pleus- (
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