n. one who derives pleasure from inflicting pain on others; one who derives sexual gratification from causing pain or humiliation to his partner

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Noun
1. someone who obtains pleasure from inflicting pain or others
(antonym) masochist
(hypernym) pervert, deviant, deviate, degenerate

nm. sadist, one who derives pleasure from inflicting pain on others, one who derives sexual gratification from causing pain or humiliation to his partner

n. sadist