any of various toxic gases, especially those used in chemical warfare to kill or incapacitate on inhalation or contact, as phosgene, chlorine, etc.
Origin of poison gas
First recorded in 1910–15
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for poison gas
Historical Examples of poison gas
Just wait for the results of the poison-gas competition presumably.
In a word my cottage was filled with some kind of poison-gas!
To begin with, he did not believe in them; they were just a part of the poison-gas of war.
I have said that it was about four oclock in the afternoon when we had our first experience of the poison-gas.
Acid sprays and poison-gas of various kinds had been tried without appreciable effect.
British Dictionary definitions for poison gas
a gaseous substance, such as chlorine, phosgene, or lewisite, used in warfare to kill or harm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
A gas or vapor used especially in chemical warfare to injure, disable, or kill upon inhalation or contact.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.