An amuse-bouche 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 free and according to the chef's selection alone. These are served both to prepare the guest for the meal and to offer a glimpse of the chef's style.
The term is French and literally means "mouth amuser". The plural form may be amuse-bouche or amuse-bouches. In France, amuse-gueule is traditionally used in conversation and literary writing, while amuse-bouche is not even listed in most dictionaries, being a euphemistic hypercorrection that appeared in the 1980s on restaurant menus and used almost only there. (In French, bouche refers to the human mouth, while gueule may mean the mouth or snout of an animal, though commonly used for mouth and derogatory only in certain expressions.)