= carbon monoxide, n.

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

A compound radical consisting of one atom of nitrogen and one of carbon (symbol CN or Cy). In the form of di-cyanogen (C2N2), it is a colourless gas…

A colourless, odourless, flammable, extremely toxic gas formed by the incomplete combustion of carbon.

a substance used to incapacitate people by causing them to sneeze when it is inhaled or absorbed through the skin.

= sneeze gas n. at sneeze, n. compounds 2.

A dark oily liquid (colourless when pure) which is a powerful respiratory irritant and causes painful blisters on contact with the skin…

A substance that causes nasal irritation; esp. a poison gas that causes irritation of the nose and eyes, pain in the chest, and nausea.

a poison gas which causes blisters on or intense irritation of the skin.

a gas used to induce nausea in people.

Hydrogen cyanide adsorbed on, or released from, a carrier in the form of small tablets, used as a fumigant and formerly as a poison gas. Usually as…

a gas intended for use in harassing or incapacitating an enemy, a rioting crowd, etc., without being lethal.