The Collaborative International Dictionary
Glycolyl
Glycolyl \Gly"co*lyl\, n. [Glycolic + -yl.] (Chem.) A divalent, compound radical, CO.CH2, regarded as the essential radical of glycolic acid, and a large series of related compounds.
Wiktionary
glycolyl
n. (context organic chemistry English) The univalent radical HO-CH2-CO- derived from glycolic acid