出典:Wiktionary
Borrowed from French demi-monde (字義どおりに “half-world”), from demi (“half”) + monde (“world; people”); possibly coined by French author and playwright Alexandre Dumas fils as the title of a comedic play, Le Demi Monde (1855):[1] see the 1864 quotation.
demimonde (複数形 demimondes)
demi-monde (複数形 demi-mondes)