| folie | Old term for madness or insanity. Origin: Fr. Folly (05 Mar 2000) |
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| folie a deux | Identical or similar mental disorders, such as a paranoid fixation, usually affecting two members of the same family living together. Synonym: shared psychotic disorder. Origin: Fr. Two (05 Mar 2000) |
| folie du doute | An excessive doubting about all the affairs of life and a morbid scrupulousness concerning minutiae. Origin: Fr. From doubt (05 Mar 2000) |
| folie du pourquoi | A psychopathologic tendency to ask questions. Origin: Fr. Why (05 Mar 2000) |
| folie gemellaire | A psychosis appearing simultaneously, or nearly so, in twins, who are not necessarily living together or intimately associated at the time. Origin: Fr. Relating to twins (05 Mar 2000) |