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

In addition to the explosives, investigators recovered an AR-15 rifle, a long gun, a military-style helmet, a ski mask, and gloves from Krebs’s vehicle, which was parked several blocks from the protest site over the weekend. —Elaine Mallon, The Washington Examiner, 17 June 2025

Phorm Energy branding will be seen on fire suits, helmets and fueler gear across Hendrick’s top teams and there will also be brand integration into Hendrick Motorsports’ new 35,000 square foot facility, which will open next year. —Dj Siddiqi, Forbes.com, 16 June 2025

Another photo shows a man in black tactical gear with a military-style helmet and a ballistic vest with the company’s name across the front. —Jim Mustian, Twin Cities, 16 June 2025

Lee swung through it, losing his helmet in the process. —Fabian Ardaya, New York Times, 15 June 2025

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