A saucer is a small, rounded dish that sits beneath a tea or coffee cup. Other kinds of saucers include objects with a similar round shape — like a flying saucer.
Saucers that live under cups are useful for catching drips from and protecting the table. Many mugs and cups come without saucers, but the cups in a traditional tea service have matching saucers, and coffee cups at a restaurant or cafe are also frequently served with saucers. Objects with a similar round shape can also be called saucers, including flying saucers and saucer-shaped TV antennas. The very earliest saucers were small sauce dishes, and the word stems from the Latin salsus, or "sauce."