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Meaning of pleuston

pleus•ton

Pronunciation: (pl'stun, -ston), [key]
— n. Biol.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.