A gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds; SYN. lacrimator.
Any of various volatile gases that produce irritation and watering of the eyes, used by police against crowds and used in chemical warfare. The gas is delivered in pressurized, liquid-filled canisters or grenades, thrown by hand or launched from a specially adapted rifle. Gases (such as Mace) cause violent coughing and blinding tears, which pass when the victim breathes fresh air, and there are no lasting effects.
Blister gases (such as mustard gas) and nerve gases are more harmful and may cause permanent injury or death. teargas