Helmet definitions

hĕl'mĭt
A piece of armor, usually made of metal, designed to protect the head.
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The hood-shaped sepal or corolla of some flowers.
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A protective head covering made of hard material, such as leather, metal, or plastic.

A firefighter's uniform includes a helmet.

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The headgear with a glass mask worn by deep-sea divers.
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A pith helmet; a topi.
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A head covering, such as a balaclava, that is shaped like a helmet.
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To provide with or put on a helmet.
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A protective covering for the head.
  • The headpiece of ancient or medieval armor.
  • The metal head covering worn in modern warfare.
  • The rigid head covering with inner padding and often a wire face mask used in football, lacrosse, and hockey.
  • The mesh-faced mask used in fencing.
  • The headpiece of a diver's suit, equipped with air tubes, glass windows, etc.
  • A fireman's protective hat.
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  • The rigid head covering worn by a motorcyclist.
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Something suggesting such a headpiece in appearance or function, as a galea of a flower.
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To cover or equip with a helmet.
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A protective head covering.
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Origin of helmet

From healmet, helmet, an Old French diminutive of helme (Modern French heaume). The Old French is itself from the Germanic helm. English since the 15th century, gradually displacing Old English helm as the generic word.