Protective headgear

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ A hard hat can protect you from having a metal spike go through your skull and into your brain. ▪ I had to put my hard hat on and go to work. ▪ If hydrogen sulfide or some other poisonous gas is detected, Donahue dons an airtight ...

Wikipedia Word definitions in Wikipedia
A hard hat is a type of helmet predominantly used in workplace environments such as industrial or construction sites to protect the head from injury due to falling objects, impact with other objects, debris, rain, and electric shock. Suspension bands inside ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also hardhat , hard-hat , late 14c., "helmet;" 1935, "derby hat;" meaning "safety helmet" is from 1953; used figuratively for "construction worker" from 1970.

Wiktionary Word definitions in Wiktionary
alt. A helmet, usually made from rigid plastic, used on construction sites to protect the head from falling objects. n. A helmet, usually made from rigid plastic, used on construction sites to protect the head from falling objects.

WordNet Word definitions in WordNet
n. a worker skilled in building offices or dwellings etc. [syn: construction worker ] a lightweight protective helmet (plastic or metal) worn by construction workers [syn: tin hat , safety hat ]