1890-95; < French, equivalent to mille thousand (< Latin; see milli-) + feuille leaf, sheet (< Latinfolia, neuter plural (taken as feminine singular) of folium)
British Dictionary definitions for millefeuille
millefeuille
/milfœj/
noun
1.
(Brit) a small iced cake made of puff pastry filled with jam and cream US name napoleon