carbonyl containing group.
any group or radical of the form RCO- where R is an organic group; "an example of the acyl group is the acetyl group"
a hydrocarbon group attached to a carbon-oxygen double bond
an alkyl group attached to a carbon-oxygen double bond
The residual structure after the hydroxyl group has been removed from the carboxyl group of acids, i.e.
Functional group derived from a carboxylic acid. (R represents an alkyl group, such as methyl.)