Definition of phosgene noun from the Oxford Advanced Learner's Dictionary

 

phosgene

 noun
noun
BrE BrE//ˈfɒzdʒiːn//
 
; NAmE NAmE//ˈfɑːzdʒiːn//
 
[uncountable]
 
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a poisonous gas that was used as a chemical weapon during the First World War Word Origin early 19th cent.: from Greek phōs ‘light’ + -gen, with reference to its original production by the action of sunlight on chlorine and carbon monoxide.
See the Oxford Advanced American Dictionary entry: phosgene