helmet

noun

hel·​met ˈhel-mət 

1

: a covering or enclosing headpiece of ancient or medieval armor see armor illustration

2

: any of various protective head coverings usually made of a hard material to resist impact

3

: something resembling a helmet

helmeted

ˈhel-mə-təd 

adjective

helmetlike

ˈhel-mət-ˌlīk 

adjective

Examples of helmet in a Sentence

Recent Examples on the Web

Riddell, likewise, has faced a number of high-profile lawsuits, primarily involving allegations that its football helmets failed to adequately protect athletes from head injuries. — Daniel Libit, Sportico.com, 27 Oct. 2026

While there are many differences between suits designed for use in space and these suits designed for testing on Earth, the biggest one is that, on an analog mission, crew members can open their helmets and breathe the outside air if necessary. — Michaela Musilova, Space.com, 27 Oct. 2026

The property also offers complimentary rentals of backpacks, hiking poles, hiking maps, and helmets for those heading out on their own. — Condé Nast, Condé Nast Traveler, 26 Oct. 2026

At the same time, the league has been trying to crack down on helmet-to-helmet contact for years, and referees believed Skattebo led with the crown of his helmet in this case. — Scott Thompson Outkick, FOXNews.com, 26 Oct. 2026

Word History

Etymology

Middle English, from Middle French, diminutive of helme helmet, of Germanic origin; akin to Old English helm helmet, Old High German helan to conceal — more at hell

First Known Use

15th century, in the meaning defined at sense 1

Phrases Containing helmet

• crash helmet
• pith helmet

Kids Definition

helmet

noun

hel·​met ˈhel-mət 

1

: a covering or enclosing headpiece of armor

2

: any of various protective head coverings usually made of a hard material

helmetlike

-ˌlīk 

adjective