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English definition of “mustard gas”

mustard gas

noun [U]    
a very poisonous gas, used as a weapon, that burns the skin, damages organs inside the body, and can killSpecific chemicals, chemical compounds and gasesSubstances and structures in the bodyTypes of chemicalArms and munitions in general
(Definition of mustard gas noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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