Definition of CS gas noun from the Oxford Advanced Learner's Dictionary

 

CS gas

 noun
noun
BrE BrE//ˌsiː es ˈɡæs//
 
; NAmE NAmE//ˌsiː es ˈɡæs//
 
[uncountable]
 
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a gas that stings the eyes, producing tears and making it difficult to breathe. CS gas is sometimes used to control crowds. see also tear gas Word Origin 1960s: from the initials of Ben B. Corson (1896–1987) and Roger W. Stoughton (1906–57), the American chemists who discovered the properties of the chemical in 1928.
See the Oxford Advanced American Dictionary entry: CS gas