Meaning of “poison gas” in the English Dictionary

british dictionary

"poison gas" in British English

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poison gasnoun [ U ]

uk /ˌpɔɪ.zən ˈɡæs/ us /ˌpɔɪ.zən ˈɡæs/

a gas that is used to kill people, especially in a war

(Definition of “poison gas” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)