Definition & Meaning of "sadist"in English

What is the origin of the term "sadist" and how is it used?

"Sadist" is a term that originated in the late 19th century, derived from the name of the French nobleman Marquis de Sade, whose writings depicted sexual gratification from inflicting pain on others. It describes a person who derives pleasure from causing physical or emotional pain, suffering, or humiliation. The term entered psychology and general usage in the 19th–20th centuries, appearing in medical, literary, and everyday contexts to identify cruel or abusive behavior. It is generally derogatory, highlighting morally objectionable or socially harmful tendencies, though it can be neutral in clinical or academic discussions.