- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for poison gas
Just wait for the results of the poison-gas competition presumably.Fantasia of the Unconscious
D. H. Lawrence
In a word my cottage was filled with some kind of poison-gas!The Green Eyes of Bst
To begin with, he did not believe in them; they were just a part of the poison-gas of war.Jimmie Higgins
I have said that it was about four oclock in the afternoon when we had our first experience of the poison-gas.In the Line of Battle
Acid sprays and poison-gas of various kinds had been tried without appreciable effect.
- 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.