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carbonyl US English

Of or denoting the divalent radical =C=O, present in such organic compounds as aldehydes, ketones, amides, and esters, and in organic acids as part of the carboxyl group

carbonyl chloride US English

Another term for phosgene.

carbonyl chloride in phosgene US English

A colorless poisonous gas made by the reaction of chlorine and carbon monoxide. It was used as a poison gas, notably in World War I