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A gas or vapor used especially in chemical warfare to injure, disable, or kill upon inhalation or contact.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Military) a gaseous substance, such as chlorine, phosgene, or lewisite, used in warfare to kill or harm
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
any toxic gas, esp. one used in chemical warfare to kill or incapacitate on inhalation or contact, as chlorine.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||poison gas - a gas that is poisonous to breath or contact; used in chemical warfare|
chemical weapon - chemical substances that can be delivered using munitions and dispersal devices to cause death or severe harm to people and animals and plants
gas - a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
blistering agent, dichloroethyl sulfide, mustard agent, mustard gas, sulfur mustard - a toxic war gas with sulfide based compounds that raises blisters and attacks the eyes and lungs; there is no known antidote
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