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phosgene
CIDE DICTIONARY
phosgene, a. [Gr. fw^s light + the root of gi`gnesqai to be born: cf. F. phosgène.].
Producing, or produced by, the action of light; -- used specifically to designate a gas also called carbonyl chloride . See Carbonyl. [1913 Webster]
phosgene, n.
A reactive chemical substance (COCl2 ), also called carbonyl choride , used in synthesis of numerous substances. In the First Worlds War it was also used as a poisonous gas in combat. [PJC]
OXFORD DICTIONARY
phosgene, n. a colourless poisonous gas (carbonyl chloride), formerly used in warfare.
Usage
Chem. formula: COCl2
Etymology
Gk phos light + -GEN, with ref. to its orig. production by the action of sunlight on chlorine and carbon monoxide
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