leu·ko·cy·to·sis also leu·co·cy·to·sis  (lōō'kə-sī-tō'sĭs)  n. pl. leu·ko·cy·to·ses also leu·co·cy·to·ses (-sēz) An abnormally large increase in the number of white blood cells in the blood, often occurring during an acute infection or inflammation. leu'ko·cy·tot'ic (-tŏt'ĭk) adj. |