Noun
a gas that is poisonous to breath or contact; used in chemical warfare
Source: WordNetI support freedom of expression, no matter whose, so I oppose DDoS attacks regardless of their target... they're the poison gas of cyberspace. John Perry Barlow
Afterward Larry felt as if he had been through a long pillow-fight in which all the pillows had been treated with a low-grade poison gas. Stephen King
Politics are very much like war. We may even have to use poison gas at times. Winston Churchill
You know we have this new poison gas - I've heard about it. The Fuehrer must do it. He must use it. Now he has to do it! Robert Ley
Pogroms are as old as Christendom; but without railways, the telegraph and poison gas there could have been no Holocaust. There have always been tyrannies; but without modern means of transport and communication, Stalin and Mao could not have built their gulags. John N. Gray
A general concern over the use of poison gas manifested itself in 1899 at the Hague Conference with a proposal prohibiting shells filled with asphyxiating gas. Source: Internet