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Definition of Carbonyl group
1. Noun. The bivalent radical CO.
Medical Definition of Carbonyl group
1. A group in which an oxygen atom is double-bonded to a carbon atom: O=C. The carbon atom then has two additional bonds to attach to the rest of the molecule. Organic molecules containing a carbonyl group are a very important, major group of compounds studied in the field of organic chemistry. (09 Oct 1997)