Plank"ton (pla&nsm;k"ton), n. [NL., fr. Gr. plagto`n, neut. of plagto`s wandering, pla`zesqai to wander.] (Biol.)
All the animals and plants, taken collectively, which live at or near the surface of salt or fresh waters. -- Plank*ton"ic (#), a.
© Webster 1913