noun.
The chlorinated form of acetophenone, C6H5-CO-CH2Cl, used as the riot control agent CN gas
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a tear gas that is weaker than CS gas but lasts longer
Word Usage
"The other 29 percent of the smoke is the tearing agent, chloroacetophenone, which has been around for nearly a century and causes severe irritation of the mucous membranes."