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Source : Webster's Revised Unabridged Dictionary (1913)

-yl \-yl\ [Gr. ? wood, material.] (Chem.)
   A suffix used as a characteristic termination of chemical
   radicals; as in ethyl, carbonyl, hydroxyl, etc.

   Note: -yl was first used in 1832 by Liebig and W["o]hler in
         naming benzoyl, in the sense of stuff, or fundamental
         material, then in 1834 by Dumas and Peligot in naming
         methyl, in the sense of wood. After this -yl was
         generally used as in benzoyl, in the sense of stuff,
         characteristic ground, fundamental material.