diphosgene

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di·phos·gene

 (dī-fŏz′jēn′)
n.
A colorless liquid, C2Cl4O2, used in organic synthesis. Its vapor was used as a poison gas in World War I.
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.

diphosgene

(daɪˈfɒzdʒiːn)
n
(Elements & Compounds) an oily liquid with an extremely poisonous vapour, made by treating methanol with phosgene and chlorinating the product: has been used in chemical warfare. Formula: ClCOOCCl3
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

di•phos•gene

(daɪˈfɒs dʒin)

n.
a colorless liquid, C2Cl4O2, used during World War I as a poison gas.
[1920–25]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.