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A univalent group, such as ethyl or propyl, having the general formula CnH2n+1.

[German Alkohol, alcohol (from Medieval Latin alcohol, antimony; see alcohol) + -yl.]


1. (Elements & Compounds) (modifier) of, consisting of, or containing the monovalent group CnH2n+1: alkyl group or radical.
2. (Elements & Compounds) an organometallic compound, such as tetraethyl lead, containing an alkyl group bound to a metal atom
[C19: from German, from Alk(ohol) alcohol + -yl]


(ˈæl kəl)
any of a series of univalent groups having the general formula CnH2n + 1, as methyl or ethyl.
[1880–85; < German, =Alk(ohol) alcohol + -yl -yl]
al•kyl′ic (-ˈkɪl ɪk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.alkyl - 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
methyl, methyl group, methyl radical - the univalent radical CH3- derived from methane
References in periodicals archive ?
Generally for a tertiary alkyl ketone, it is very common to undergo Norrish I cleavage and produce corresponding tertiary carbon free radical with leaving of acetyl radical.
has received a patent for a pigment dispersing resin which is a copolymer of sulfonic group-containing polymerizable unsaturated monomer; polyoxyalkylene chain-containing nonionic polymerizable unsaturated monomer; (meth)acrylic acid ester type polymerizable monomer having two tertiary alkyl groups per molecule and/or (meth)acrylic acid ester type polymerizable monomer having one tertiary alkyl group and one secondary hydroxyl group per molecule; and other ethylenically unsaturated monomer and where the copolymer is obtained by the copolymerization of monomers at the following proportion on the basis of the total weight of monomers.