Acetyl

n. radical of acetic acid that contains a carbonyl and methyl group, CH3CO (Chemistry)

In organic chemistry, acetyl (ethanoyl), is a functional group, the acyl of acetic acid, with chemical formula -COCH3. It is sometimes abbreviated as Ac (not to be confused with the element actinium). The acetyl radical contains a methyl group single-bonded to a carbonyl. The carbon of the carbonyl has a lone electron available, with which it forms a chemical bond to the remainder R of the molecule.
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Noun
1. the organic group of acetic acid (CH3CO-)
(synonym) acetyl group, acetyl radical, ethanoyl group, ethanoyl radical
(hypernym) acyl, acyl group
(derivation) acetylate, acetylize, acetylise

n. acetyl, contains acetyl (type of chemical compound)

(n.)
A complex, hypothetical radical, composed of two parts of carbon to three of hydrogen and one of oxygen. Its hydroxide is acetic acid.