/ Dictionary / Index Z zooplankton: Meaning and Definition of Find definitions for: zo•o•plank•ton Pronunciation: (zō"u-plangk'tun), [key] — n. the aggregate of animal or animallike organisms in plankton, as protozoans. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: zooplankton (Thesaurus) zoophyte zooplasty Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language