Well

The porcelain maker refers to the inner surface of a flat part surrounded by a rim as a “well”. In contrast to rim plates, however, the inner surface of coup forms is not called a well. The base ring of a saucer is also called a “well”, i.e. it describes the surface area for the base ring of an upper cup. The chef and serving master correctly refer to the well as serving surface, sideboard or inner surface.

The well is usually framed by a rim.