Definition of "medallion"

A large medal, usually decorative.  examples

A cut of meat resembling a large medal.  examples

(art) A usually round or oval frame (often made of stucco) containing a decoration.  examples

A circular certificate used in some places to register a vehicle, especially a taxicab.  examples

A yellowish brown.  examples

(transitive, poetic) To mark with, or as with, a medallion or medallions.  examples