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

Among the most successful hits was against UKRTAC, a Ukrainian defense company responsible for producing body armor, helmets, tactical gear, and other protective equipment. — Brady Knox, The Washington Examiner, 19 July 2026

Adding a human to a cockpit requires many more millions of dollars in cost, including small items such as the explosive bolts needed to launch ejector seats and specialized helmets. — Phillips Payson O’Brien, The Atlantic, 18 July 2026

Lewis, 10, survived with a concussion, cuts and bruises despite not wearing a helmet at the time of the crash. — Toria Sheffield, PEOPLE, 18 July 2026

Child allegedly entered the restaurant wearing a motorcycle helmet and dark clothing, making off with the cash register till and an undisclosed amount of money. — Rachel Roberts, Idaho Statesman, 17 July 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