The usually microscopic animal and plant life found floating or drifting in the ocean or in bodies of fresh water, used as food by nearly all aquatic animals.
Webster's New World
Other Word Forms of Plankton
Origin of Plankton
German from Greek neuter of planktos wandering from plazein to turn aside plāk-2 in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
From German Plankton, coined by Viktor Hensen and derived from Ancient Greek πλαγκτός (planktos, “drifter").
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