- Main Entry:
- idée fixe

- Pronunciation:
-
\(ˌ)ē-ˌdā-ˈfēks\
- Function:
- noun
- Inflected Form(s):
- plural idées fixes \-ˈfēks(-əz)\

: a usually delusional idea that dominates the whole mental life during a prolonged period (as in certain mental disorders)—called also fixed idea