| any of several poison gases, derived chiefly from phosphoric acid, that weaken or paralyze the nervous system, esp. that part of the system controlling respiration. |

nerve gas n.
Any of various poisonous gases that interfere with the functioning of nerves by inhibiting cholinesterase.
| nerve gas
Any of various poisonous gases that interfere with the functioning of nerves by inhibiting the breakdown of the neurotransmitter acetylcholine. Increased levels of acetylcholine stimulate the parasympathetic nervous system, leading to cardiac and respiratory arrest. |