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- DictionaryBlood·let·ting/ˈblədˌlediNG/
noun
- 1. the surgical removal of some of a patient's blood for therapeutic purposes. historical
noun
Bloodletting (or blood-letting) is the withdrawal of blood from a patient to prevent or cure illness and disease. Bloodletting, whether by a physician or by leeches, was based on an ancient system of medicine in which blood and other bodily fluids were regarded as "humours" that had to remain in proper balance to maintain health. It is the most common medical practice performed by surgeons from an... Wikipedia