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pleural cavity
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pleurodont
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pleuston
pleus·ton [ plstən, pl stòn ]


noun 
Definition:
 
small organisms on water surface: small animals and plants such as algae that float on the surface of a pool of fresh water
[Mid-20th century. < Greek pleusis "sailing," after plankton]

pleus·ton·ic [ ploo stónnik ] adjective
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