a chemical substance producing a specific effect, esp. when intentionally used for this reason; (now often) spec. a substance used to…

a weapon that depends for its effect on the release of toxic or noxious chemicals; also occasionally in extended use; frequently in plural.

An organic arsenic compound which induces vomiting and is irritating to the eyes and lungs, used in the form of an aerosol in chemical warfare, riot…

A proprietary name for: an irritant chemical preparation used in aerosol form as a disabling weapon for spraying at a person's face. More fully Che…