carbonyl : Idioms & Phrases
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 calledphosgene gas ; called alsocarbon oxychloride .
Webster 1913
carbonyl group
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noun the bivalent radical CO