/peuh nash", -nahsh"/ , n.
1. a grand or flamboyant manner; verve; style; flair: The actor who would play Cyrano must have panache.
2. an ornamental plume of feathers, tassels, or the like, esp. one worn on a helmet or cap.
3. Archit. the surface of a pendentive.
[ 1545-55; var. (after F) of pennache pennachio pinnaculum, dim. of pinna wing; identical in form with pinnaculum PINNACLE ]