noun
or leu·co·sis lüˈkōsə̇s
( plural leuko·ses or leuco·ses -ōˌsēz)
Etymology: New Latin, from leuc- + -osis
1. : leukemia
2. : any of several poorly differentiated diseases of poultry commonly grouped as the avian leukosis complex that involve disturbed blood formation and are distinguished individually by special manifestations (as paralysis, tumor formation, leukemia, and eye damage) — see big liver disease , fowl paralysis , lymphomatosis , osteopetrosis , pearl eye