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English definition of “tear gas”

tear gas

noun [U]    
a gas used by some police and armed forces to control crowds of people. It hurts the eyes and makes them produce tears.Specific chemicals, chemical compounds and gasesSubstances and structures in the bodyTypes of chemicalArms and munitions in general
(Definition of tear gas noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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