any of various gases or vapours which are harmful when inhaled or absorbed through the skin, used esp. to disable an enemy in warfare.

spec. Any of various substances released in gaseous form with the intent of harming or deterring; esp. = poison gas n. at poison, n. compounds 2a.

A colourless oily liquid whose vapour causes severe irritation and blistering of the skin, used in chemical warfare, originally at Ypres during…

a lachrymatory gas used in warfare or riot control to disable opponents or make crowds disperse; hence as v. transitive, to attack with tear gas, to…

= mustard gas, n.

Short for mustard gas, n.

A colourless poisonous gas, made by the reaction of chlorine and carbon monoxide in the presence of light or a catalyst, which has been used in…

gas that causes severe irritation to the eyes or respiratory system, used chiefly in riot control to force crowds to disperse; tear gas.

a gas or other chemical agent used in war to produce irritant or poisonous effects.

a gas used to induce nausea in people.

a toxic substance in the form of a vapour or gas that disables or kills by interfering with neurotransmission.

= tear-gas n. above.

The name of an odourless organophosphorus nerve gas.

The name of an odourless organophosphorus nerve gas.

An anti-personnel gas that irritates the throat and nasal passages. Cf. pepper spray, n. 2.

a gas that incapacitates by causing temporary confusion and disorientation.

A liquid derived from oleoresin capsicum, causing inflammation of the eyes and respiratory passages and employed as a disabling weapon in the form…