The headgear with a glass mask worn by deep-sea divers.
A head covering of hard material, such as leather, metal, or plastic, worn by football players, firefighters, construction workers, motorcyclists, and others to protect the head.
A pith helmet; a topi.
A head covering, such as a balaclava, that is shaped like a helmet.
A piece of armor, usually made of metal, designed to protect the head.
Botany The hood-shaped sepal or corolla of some flowers.