Pièce de résistance
[French : pièce, piece + de, of, with + résistance, staying power, lastingness.]
Noun 1. piece de resistance - the outstanding item (the prize piece or main exhibit) in a collection
collector's item, showpiece
curio, curiosity, oddment, peculiarity, rarity, oddity - something unusual -- perhaps worthy of collecting
rariora - (plural) rare collector's items
2. piece de resistance - the most important dish of a meal
dish - a particular item of prepared food; "she prepared a special dish for dinner"
Even with a diverse movie and television portfolio, Burnett's pièce de résistance will likely forever be The Carol Burnett Show.
Originally, the pièce de résistance was the most substantial dish in a meal, but now the term generally refers to quality, not quantity.