Medical Term:

plankton

Pronunciation: plangk′tŏn

Definition: A general term for many floating marine forms, mostly of microscopic or minute size, which are moved passively by winds, waves, tides, or currents; it includes diatoms, algae, copepods, and many protozoans, crustacea, mollusks, and worms.

[G. planktos, wandering]

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