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carbonyl group

noun
1.
the bivalent radical CO, occurring in acids, ketones, aldehydes, and their derivatives.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for carbonyl-group

carbonyl group

in organic chemistry, a divalent chemical unit consisting of a carbon (C) and an oxygen (O) atom connected by a double bond. The group is a constituent of carboxylic acids, esters, anhydrides, acyl halides, amides, and quinones, and it is the characteristic functional group (reactive group) of aldehydes and ketones. Carboxylic acids (and their derivatives), aldehydes, ketones, and quinones are also known collectively as carbonyl compounds.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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