/ ˈseɪdɪst; NAmE / noun
a person who gets pleasure, especially sexual pleasure, from hurting other people
► sad·is·tic / səˈdɪstɪk; NAmE / adjective :
He took sadistic pleasure in taunting the boy.
► sad·is·tic·al·ly /-kli/ adverb
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WORD ORIGIN
late 19th cent.: from French sadisme , from the name of the Marquis de Sade .