mustard gas

noun
an oily liquid, C 4 H 8 Cl 2 S, used as a chemical-warfare gas, blistering the skin and damaging the lungs, often causing blindness and death: introduced by the Germans in World War I.


Origin:
1915–20; so called from its mustard-like odor

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World English Dictionary
mustard gas
 
n
an oily liquid vesicant compound used in chemical warfare. Its vapour causes blindness and burns. Formula: (ClCH2CH2)2S

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

mustard gas mus·tard gas (mŭs'tərd)
n.
An oily, volatile liquid that is corrosive to the skin and mucous membranes, causes severe, sometimes fatal respiratory damage and was used in World War I as a chemical warfare agent.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
mustard gas   (mŭs'tərd)  Pronunciation Key 
An oily, volatile liquid that is corrosive to the skin and mucous membranes and causes severe, sometimes fatal respiratory damage. It was introduced in World War I as a chemical warfare agent. Chemical formula: C4H8Cl2S.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The invaders retaliated with mustard gas, dropped by plane.
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