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sadist

[sey-dist, sad-ist]
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noun
  1. Psychiatry. a person who has the condition of sadism, in which one receives sexual gratification from causing pain and degradation to another.
  2. a person who enjoys being cruel.
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Origin of sadist

First recorded in 1890–1920; sad(ism) + -ist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for sadist

n.

1892, from sadism + -ist.

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Online Etymology Dictionary, © 2010 Douglas Harper