CS gas

Từ điển Oxford Advanced Learner 8th

CS gas BrE [ˌsiː es ˈɡæs] NAmE [ˌsiː es ˈɡæs] noun uncountable
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:
[CS gas] 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.