Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “gas mask”

gas mask

noun [C]
a device a person wears over the face to protect against breathing in poisonous gases
(Definition of gas mask noun from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definitions of “gas mask” in other dictionaries

Word of the Day


a situation in which two people are friends

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More