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

 

breastplate

 noun
noun
BrE BrE//ˈbrestpleɪt//
 
; NAmE NAmE//ˈbrestpleɪt//
 
 
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a piece of armour worn by soldiers in the past to protect the upper front part of the body
See the Oxford Advanced American Dictionary entry: breastplate