Webster's English Dictionary

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alkyl

al.kyl \'al-k*l\ \al-'kil-ik\ n [prob. fr. G, fr. alkohol alcohol, fr. ML 
   alcohol] 1a: a univalent aliphatic radical CnH2n+1  1b: any univalent 
   aliphatic, aromatic-aliphatic, or alicyclic hydrocarbon radical 2: a 
   compound of alkyl radicals with a metal  - al.kyl.ic aj