leu·ko·cy·to·sis also leu·co·cy·to·sis 
(l′kə-sī-tōsĭs)
(l′kə-sī-tōsĭs)n. pl. leu·ko·cy·to·ses (-sēz) also leu·co·cy·to·ses
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·totic (-tŏtĭk) adj.