nerve gas; nerve agent
Refers to chemical weapons that attack the nervous system, such as sarin or VX.
地下鉄サリン事件では神経ガスが使われた。
Nerve gas was used in the subway sarin attack.
神経ガス is the general term for any nerve gas, while サリン names one specific, well-known nerve agent.
神経ガス (nerve gas) is one specific class of chemical weapon, while 毒ガス is the broader term covering any toxic gas.
Compound of 神経 (nerve) and ガス (gas), a direct calque of English 'nerve gas'.