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The small or microscopic organisms that drift or swim weakly in a body of water, including bacteria, diatoms, jellyfish, and various larvae. Plankton is an important food source for fish and other larger organisms.
[German, from Greek, neuter of planktos, wandering, from plazein, to turn aside; see plāk- in Indo-European roots.]
plank·ton′ic (-tŏn′ĭk) adj.
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|Adj.||1.||planktonic - of or relating to plankton|