[fos-jeen, foz-]
noun Chemistry.
a poisonous, colorless, very volatile liquid or suffocating gas, COCl 2 , a chemical-warfare compound: used chiefly in organic synthesis.
Also called carbon oxychloride, carbonyl chloride, chloroformyl chloride.

1805–15; < Greek phôs light (contraction of pháos) + -genēs -gen Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phosgene (ˈfɒzdʒiːn)
a colourless easily liquefied poisonous gas, carbonyl chloride, with an odour resembling that of new-mown hay: used in chemical warfare as a lethal choking agent and in the manufacture of pesticides, dyes, and polyurethane resins. Formula: COCl2
[C19: from Greek phōs light + -gene, variant of -gen]

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

phosgene phos·gene (fŏs'jēn', fŏz'-)
A colorless volatile liquid or gas used as a poison gas and in making dyes.

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
phosgene   (fŏs'jēn')  Pronunciation Key 
A colorless, volatile gas that has the odor of freshly mowed hay. When it reacts with water (as in the lungs during respiration), phosgene produces hydrochloric acid and carbon monoxide. It is used in making glass, dyes, resins, and plastics, and was used as a poisonous gas during World War I. Also called carbonyl chloride. Chemical formula: COCl2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Information on phosgene, a potential agent for chemical terrorism.
Phosgene oxime was developed as a chemical warfare agent.
One of these accidents involved the fatal release of phosgene.
Diphosgene probably has similar reactivity to that of phosgene.
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