Definition of crash helmet noun from the Oxford Advanced Learner's Dictionary

 

crash helmet

 noun
noun
BrE BrE//ˈkræʃ helmɪt//
 
; NAmE NAmE//ˈkræʃ helmɪt//
 
 
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a hat made of very strong material and worn when riding a motorcycle to protect the head
See the Oxford Advanced American Dictionary entry: crash helmet