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must (4)
must-have
must-see
mustache
mustachio
mustang
mustard
mustard and cress
mustard gas
mustard oil
mustard plaster
mustee
musteline
muster
muster in
muster out
muster roll
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mustard gas
mus·tard gas


noun 
Definition:
 
type of poison gas: an oily liquid that evaporates into a poison gas. Used in chemical warfare, it burns the skin and causes often fatal respiratory damage. (CH2CLCH2)2S
[Because its smell resembles mustard]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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