Bloodletter is a term that originated in medieval times when physicians used to perform bloodletting to alleviate illnesses. Today, it is more commonly used to refer to those who intentionally cause pain or harm to others. Synonyms for bloodletter include sadist, torturer, executioner, butcher, killer, assassin, and murderer. These words evoke a sense of violence and brutality, and are often used in the context of crime investigation, war, or horror movies. While bloodletting may have been a legitimate medical practice centuries ago, modern society condemns those who derive pleasure from inflicting pain and sorrow on others.