Definition from Wiktionary, the free dictionary
medallion (plural medallions)
- A large medal, usually decorative.
- A cut of meat resembling a medallion.
- (architecture) A round or oval frame (often made of Stucco) which contains a plastic or pictorial decoration of a facade, an interior, a piece of furniture or equipment.
- A circular certificate used in some places to register a vehicle, especially a taxicab.
Derived terms 
Related terms 
large decorative medal