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phosgene n. 光气 光气 phosgene n 1: a colorless poisonous gas that smells like new-mown hay; used in chemical warfare Phosgene \Phos"gene\, a. [Gr. fw^s light the root of
gi`gnesqai to be born: cf. F. phosg[`e]ne.] (Old Chem.) Producing, or produced by, the action of light; -- used specifically to designate a gas also called carbonyl chloride. See {phosgene}, n., and {Carbonyl}. [1913 Webster PJC] phosgene \phos"gene\ (f[o^]s"j[=e]n or f[o^]z"j[=e]n), n. (Chem.) A reactive chemical substance ({COCl2}), also called {carbonyl choride}, used in synthesis of numerous substances. In the First World War it was also used as a poisonous gas in combat. [PJC] Carbonyl \Car"bon*yl\, n. [Carbon -yl.] (Chem.) The radical ({=CO}), occuring, always combined, in many compounds, as the aldehydes, the ketones, urea, carbonyl chloride, etc. [1913 Webster] Note: Though denoted by a formula identical with that of carbon monoxide, it is chemically distinct, as carbon seems to be divalent in carbon monoxide, but tetravalent in carbonyl compounds. [1913 Webster] {Carbonyl chloride} (Chem.), a colorless gas, {COCl2}, of offensive odor, and easily condensable to liquid. It is formed from chlorine and carbon monoxide, under the influence of light, and hence has been called {phosgene}, or {phosgene gas}; -- called also {carbon oxychloride}. It is used in chemical synthesis, and was also used as a poison gas in World War I. [1913 Webster PJC]
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