folie à deux

fo·lie à deux

[fo-lee uh doo; French faw-lee a dœ]
noun, plural fo·lies à deux [fo-leez uh doo; French faw-lee za dœ] . Psychiatry.
the sharing of delusional ideas by two people who are closely associated.

Origin:
1890–95; < French

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World English Dictionary
folie à deux (ˈfɒlɪ æ ˈdɜː) [Click for IPA pronunciation guide]
 
n
psychiatry mental illness occurring simultaneously in two intimately related persons who share some of the elements of the illness, such as delusions
 
[French: madness involving two (people)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Folie à deux is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
American Heritage
Medical Dictionary

folie á deux fo·lie á deux (fô-lē' ä dɶ', fŏl'ē)
n.
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
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