"Designating types or stages of leukaemias and related diseases in which the leucocyte count in the blood is not elevated; especially in aleukaemic leukaemia", Late 19th cent.; earliest use found in American Journal of the Medical Sciences. From a- + leukaemic, after French aleucémique or its etymon German aleukämisch.[aleukaemic etymology, aleukaemic origin, 英语词源]