: a solid, liquid, or gaseous substance that on dispersion in the atmosphere irritates mucous membranes resulting especially in blinding of the eyes with tears and that is used chiefly (as by the police and the military) to disperse large crowds of people
variants
or tear gas
or less commonly teargas
tear-gassed or tear gassed also teargassed; tear-gassing or tear gassing also teargassing; tear-gases or tear gasses also teargasses
: to use tear gas on
The troops then tear-gassed the crowd of several hundred, mostly teenagers and young men, which scattered in great confusion, but re-formed later.—Roger Daniels
Cite this Entry
“Tear gas.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tear%20gas. Accessed 20 Oct. 2026.
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