A person or medical device that bleeds someone, especially in medieval medical practice based on the theory of balancing bodily humors.
From flem or fleme plus -er (agent suffix meaning 'one who does'), referring to practitioners who bled patients as treatment, a common medieval medical procedure.
Bloodletters were once respected medical professionals who used lancets and leeches to remove 'excess' blood—they thought it cured everything from fevers to madness, but it usually just made patients weaker!
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