Breadcrumb Home > Dictionary > Index L leucocytosis: Meaning and Definition of Find definitions for: leu•co•cy•to•sis Pronunciation: (l"kō-sī-tō'sis), [key] — n. Physiol., Pathol. leukocytosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: leucocytosis (Thesaurus) leucocyte leucoderma ✖ Related Content Daily Word Quiz: porcine Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language