Breadcrumb Home > Dictionary > Index P plankton: Meaning and Definition of Find definitions for: plank•ton Pronunciation: (plangk'tun), [key] — n. the aggregate of passively floating, drifting, or somewhat motile organisms occurring in a body of water, primarily comprising microscopic algae and protozoa. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plankton (Thesaurus) plankter planned economy TrendingHere are the facts and trivia that people are buzzing about. The Book of 1 Corinthians: Summary Current Events This Week: June 2023 Languages Spoken in Each Country of the World Aesop's Fables: Aesop's Fables Milestones in Environmental Protection The 12 Labors of Hercules (In Order) ✖ Related Content Daily Word Quiz: concatenate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language