Meaning of “mustard gas” in the English Dictionary

british dictionary

"mustard gas" in British English

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mustard gasnoun [ U ]

uk /ˈmʌs.təd ˌɡæs/ us /ˈmʌs.tɚd ˌɡæs/

a very poisonous gas, used as a weapon, that burns the skin, damages organs inside the body, and can kill

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