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

 

greatcoat

 noun
noun
BrE BrE//ˈɡreɪtkəʊt//
 
; NAmE NAmE//ˈɡreɪtkoʊt//
 
 
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a long heavy coat, especially one worn by soldiers
See the Oxford Advanced American Dictionary entry: greatcoat