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[dahy-fos-jeen] /daɪˈfɒs dʒin/
noun, Chemistry
a colorless liquid, C 2 Cl 4 O 2 , usually derived from methyl formate or methyl chloroformate by chlorination: a World War I poison gas now used chiefly in organic synthesis.
1920-25; di-1 + phosgene Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for diphosgene


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 & Unabridged 2012 Digital Edition
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diphosgene in Medicine

diphosgene di·phos·gene (dī-fŏz'jēn')
A colorless liquid that is used in organic synthesis and whose vapor was used as a poison gas in World War I. Also called trichlormethyl chloroformate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for diphosgene

in chemical warfare, poison gas widely used by Germany during World War I. Its chemical name is trichloromethyl chloroformate, and it is a colourless, moderately persistent, poisonous, organic compound, the odour of which is likened to that of newly mown hay. It is easily condensable to a liquid. In gaseous form, it is a respiratory irritant that is often lethal. It irritates and inflames the inner part of the bronchial tubes and lungs and causes steady coughing, difficulty in breathing, and, frequently, acute pulmonary edema. It was first used in December 1915.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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