folie a deux

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Related to Folie a famille: Induced delusional disorder
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Words related to folie a deux

the simultaneous occurrence of symptoms of a mental disorder (as delusions) in two persons who are closely related (as siblings or man and wife)

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Another method of classification is based on the number of individuals involved: folie a trois (three), folie a quatre (four), folie a cinq (five), and, as mentioned earlier, folie a famille.