1. (尤指用链子挂于颈部的)圆形金属饰物
A medallion is a round metal disc which some people wear as an ornament, especially on a chain round their neck.

1. an award for winning a championship or commemorating some other event

Synonym: decorationlaurel wreathmedalpalmribbon

2. an emblem indicating that a taxicab is registered

3. a circular helping of food (especially a boneless cut of meat)

e.g. medallions of veal

4. any of various large ancient Greek coins