What is the meaning of Plankton?

Organisms, especially small and microscopic ones, that drift in water.

A plankter, any single organism that drifts in water.

plankton (a collection of immobile or slightly mobile organisms floating in a body of water)

plankton (generic term for all the organisms that float in the sea)

plankton (totality of individuals, institutions, and organizations that have little importance in a given sphere of social life)

Source: wiktionary.org

See also