‖Plank″ton (plăṉk″tŏn), n. [NL., fr. Gr. πλαγτόν, neut. of πλαγτόσ wandering, πλάζεσθαι 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.