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psychopath (n.)

1885, in the criminal psychology sense, a back-formation from psychopathic.

The Daily Telegraph had, the other day, a long article commenting on a Russian woman who had murdered a little girl. A Dr. Balinsky prevailed upon the jury to give a verdict of acquittal, because she was a "psychopath." The Daily Telegraph regards this term as a new coinage, but it has been long known amongst Spiritualists, yet in another sense. ["The Medium and Daybreak," Jan. 16, 1885]

The case alluded to, and the means of acquittal, were briefly notorious in England and brought the word into currency in the modern sense.

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Definitions of psychopath from WordNet

psychopath (n.)
someone with a sociopathic personality; a person with an antisocial personality disorder (`psychopath' was once widely used but has now been superseded by `sociopath');
Synonyms: sociopath
From wordnet.princeton.edu