Definition of medallion noun from the Oxford Advanced Learner's Dictionary

 

medallion

 noun
noun
BrE BrE//məˈdæliən//
 
; NAmE NAmE//məˈdæliən//
 
Jewellery
 
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a piece of jewellery in the shape of a large flat coin worn on a chain around the neck See related entries: Jewellery Word Origin mid 17th cent.: from French médaillon, from Italian medaglione, augmentative of medaglia, from medieval Latin medalia ‘half a denarius’ (ancient Roman silver coin), from Latin medialis ‘medial’.
See the Oxford Advanced American Dictionary entry: medallion