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



BrE BrE//ˈhelmɪt//
; NAmE NAmE//ˈhelmɪt//
American football
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a type of hard hat that protects the head, worn, for example, by a police officer, a soldier or a person playing some sports see also crash helmet See related entries: American football Word Originlate Middle English: from Old French, diminutive of helme, of Germanic origin.Extra examples Police in riot helmets lined the streets. A protective helmet should be worn at all times. It is illegal to ride a motorcycle without a crash helmet.
See the Oxford Advanced American Dictionary entry: helmet