helmet
hel·met [helmet helmets helmeted helmeting] BrE [ˈhelmɪt] NAmE [ˈhelmɪt] noun 
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
Word Origin:
late Middle English: from Old French, diminutive of helme, of Germanic origin.
Example Bank:
•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.
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