Real Dictionary

blood doping in American English
the practice of draining and freezing a person's blood and then restoring it just prior to intense physical effort, esp. to an athlete just before competition, so as to improve endurance by the sudden, temporary increase in red blood cells available for c
noun: a procedure in which an athlete is injected with his or her own blood or the blood of a family member prior to competition, purportedly increasing the blood's oxygen-carrying capacity owing to the addition of red blood cells

blood doping in British English
noun: the illegal practice of removing a quantity of blood from an athlete long before a race and reinjecting it shortly before a race, so boosting oxygenation of the blood