from The American Heritage® Dictionary of the English Language, 4th Edition
- suffix An organic acid radical: carbonyl.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- suffix A univalent radical or functional group formed from a given molecule. Thus "propyl" from propane, "benzyl" from benzene, and so forth.
from the GNU version of the Collaborative International Dictionary of English
- A suffix used as a characteristic termination of chemical radicals; as in ethyl, carbonyl, hydroxyl, etc.
from The Century Dictionary and Cyclopedia
- n. In chem., a suffix commonly used with radicals, denoting the fundamental part, the origin: as, methyl, CH3, is the fundamental radical of wood alcohol, CH3OH, methylic ether, (CH3)2O, methyl anime, CH3NH2, etc.
French -yle, from Greek hūlē, wood, matter.(American Heritage® Dictionary of the English Language, Fourth Edition)
Back-formation from methyl, itself a back-formation from methylene (Wiktionary)