Definition of "helmet" []

• 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. (noun)
• The headgear with a glass mask worn by deep-sea divers. (noun)
• A pith helmet; a topi. (noun)
• A head covering, such as a balaclava, that is shaped like a helmet. (noun)
• A piece of armor, usually made of metal, designed to protect the head. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Made popular by the summer blockbuster hit, Star Wars the Clone Wars, this helmet is a replica of one of the helmets worn by the clone troopers from this film."
• "Thanks for not saying that wearing a helmet is the best way to be safer."
• "I agree the balaclava helmet is a great piece of kit, not only to be used in relations to crimes."