Other forms: amuse-gueules
An amuse-gueule is a small taste of food that's meant to whet your appetite for a larger meal to follow. At a fancy restaurant, you might be served an amuse-gueule before the first course.
The French amuse-gueule means "it entertains the mouth," and it refers to a bite-sized serving of food that's usually chosen by a chef rather than ordered off a menu. It has the same meaning as amuse-bouche, which is more commonly used by English speakers. If you say, "What a delicious amuse-gueule!" after you pop a truffled quail egg or tiny seared scallop in your mouth, you'll know you're using the more authentically French term.