Source : Webster's Revised Unabridged Dictionary (1913)

Glyceryl \Glyc"er*yl\, n. [Glycerin + -yl.] (Chem.)
   A compound radical, {C3H5}, regarded as the essential radical
   of glycerin. It is metameric with allyl. Called also
   {propenyl}.

Source : WordNet®

glyceryl
     n : a trivalent radical derived from glycerol by removing the
         three hydroxyl radicals