Noun
English Wikipedia has an article on:gas maskWikipedia
gas mask (plural gas masks)
A covering for the face with a filter to protect the user from poison gas.
gas-mask
All the children had to wear a gas mask in case of a gas attack by the Germans. They tried to make the masks like Mickey Mouse faces so the children would like them. But I didn't. They had big ears on them. Gerald Scarfe
My mother was a trained nurse, and she'd tell me that patients would fight as they were administered anaesthetic, grappling to get the gas mask off their face. Maeve Binchy
According to Ben Rich’s memoir, an engineer jokingly showed up to work one day wearing a Civil Defense gas mask. Source: Internet
Also, a gas mask does not protect against other hazards; for example, corrosive gases can damage the skin, requiring full-body protection. Source: Internet
Anyone who works with the metal should wear pre-cleaned non-sparking shoes, flame-resistant rubber clothes, rubber gloves, apron, goggles, and a gas mask. Source: Internet
Above the zippered neck of the coveralls, a bug-eyed gas mask. Source: Internet