/ Dictionary / Index P plankter: Meaning and Definition of Find definitions for: plank•ter Pronunciation: (plangk'tur), [key] — n. any organism that is an element of plankton. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. planking plankton Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language