Wikipedia
An amuse-bouche (plural amuse-bouches) or amuse-gueule is a single, bite-sized'' hors d’œuvre''. Amuse-bouches are different from appetizers in that they are not ordered from a menu by patrons, but are served gratis and according to the chef's selection alone. These, often accompanied by a complementing wine, are served both to prepare the guest for the meal and to offer a glimpse into the chef's approach to the art of cuisine.
The term is French, literally translated as "mouth amuser". The plural form is amuse-bouche or amuse-bouches. In France, is the proper term normally employed in conversation and literary writing, while amuse-bouche is a euphemistic hypercorrection that appeared in the 1980s on restaurant menus and is used almost only there. In French, bouche refers to the human mouth, while gueule refers to the mouth or snout of an animal, and is used as a derogatory term for mouth or face.