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Definition of: plankton
(plangk′tən) noun Biol.
The floating, weakly swimming or drifting plant or animal organic life of the sea, as distinguished from the coastal or the bottom forms: used also of analogous life forms in fresh–water lakes. Compare BENTHOS. [<G <Gk., neut. of planktos drifting, wandering <plazesthai wander]
—plank·ton·ic (plangk·ton′ik) adjective
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