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alienist

[eyl-yuh-nist, ey-lee-uh-] /ˌeɪl yə nɪst, ˌeɪ li ə-/
noun
1.
(formerly) a doctor specializing in the treatment of mental illness.
2.
an expert witness in a sanity trial.
Origin of alienist
1860-1865
1860-65; alien(ation) + -ist; compare French aliéniste in same sense
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for alienist

alienist

/ˈeɪljənɪst; ˈeɪlɪə-/
noun
1.
(US) a psychiatrist who specializes in the legal aspects of mental illness
2.
(obsolete) a person who practises alienism
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for alienist
n.

"one who treats mental illness, 'mad doctor,' " 1864, from French aliéniste, from alienation in the sense of "insanity, loss of mental faculty," a sense attested in English from late 15c. (see alienate).

Online Etymology Dictionary, © 2010 Douglas Harper
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alienist in Medicine

alienist al·ien·ist (āl'yə-nĭst, ā'lē-ə-)
n.
A physician accepted by a court of law as an expert on the mental competence of principals or witnesses.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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