alkyl

[al-kuh l] /ˈæl kəl/
adjective
1.
containing an alkyl group.
noun
2.
an alkyl group.
Origin
1880-85; < German, equivalent to Alk(ohol) alcohol + -yl -yl
British Dictionary definitions for alkyl

alkyl

/ˈælkɪl/
noun
1.
(modifier) of, consisting of, or containing the monovalent group CnH2n+1: alkyl group or radical
2.
an organometallic compound, such as tetraethyl lead, containing an alkyl group bound to a metal atom
Word Origin
C19: from German, from Alk(ohol) alcohol + -yl
alkyl in Medicine

alkyl al·kyl (āl'kəl)
n.
A monovalent radical, such as ethyl or propyl, having the general formula CnH2n+1.

alkyl in Science
alkyl
  (āl'kəl)   
A radical that has the general formula CnH2n+1, formed by removing a hydrogen atom from an alkane. Ethyl and propyl are alkyls.