plank·ton (pl ngk t n)n. The collection of small or microscopic organisms, including algae and protozoans, that float or drift in great numbers in fresh or salt water, especially at or near the surface, and serve as food for fish and other larger organisms. [German, from Greek, neuter of planktos, wandering, from plazein, to turn aside; see pl  k-2 in Indo-European roots.]plank·ton ic (-t n k) adj. |
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| Adj. | 1. | planktonic - of or relating to plankton |
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