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folie à deux

[fo-lee uh doo; French faw-lee a dœ] /fɒˈli ə ˈdu; French fɔ li a ˈdœ/
noun, plural folies à deux
[fo-leez uh doo; French faw-lee za dœ] /fɒˈliz ə ˈdu; French fɔ li za ˈdœ/ (Show IPA).
the sharing of delusional ideas by two people who are closely associated.
Origin of folie à deux
Borrowed into English from French around 1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for folie a deux

folie à deux

/ˈfɒlɪ æ ˈdɜː/
(psychiatry) mental illness occurring simultaneously in two intimately related persons who share some of the elements of the illness, such as delusions
Word Origin
French: madness involving two (people)
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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folie a deux in Medicine

folie á deux fo·lie á deux (fô-lē' ä dɶ', fŏl'ē)
A condition in which symptoms of a mental disorder, occur simultaneously in two individuals who share a close relationship or association.

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