/ Dictionary / Index C cytokinin: Meaning and Definition of Find definitions for: cy•to•ki•nin Pronunciation: (sī"tu-kī'nin), [key] — n. Biochem. any of a class of plant hormones, produced by the roots and traveling upward through the xylem, that promote tissue growth and budding and, on application, retard plant senescence. Cf. kinetin, zeatin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cytokinin (Thesaurus) cytokinesis cytol. Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language