Poison-gas

poison gas

noun
any of various toxic gases, especially those used in chemical warfare to kill or incapacitate on inhalation or contact, as phosgene, chlorine, etc.

Origin:
1910–15

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Collins
World English Dictionary
poison gas
 
n
a gaseous substance, such as chlorine, phosgene, or lewisite, used in warfare to kill or harm

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

poison gas n.
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.
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