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|Noun||1.||alkyl radical - any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons|
chemical group, radical, group - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
ethyl, ethyl group, ethyl radical - the univalent hydrocarbon radical C2H5 derived from ethane by the removal of one hydrogen atom