The Collaborative International Dictionary
Glycolide
Glycolide \Gly"co*lide\, n. [Glycol + anhydride.] (Chem.) A white amorphous powder, C4H4O, obtained by heating and dehydrating glycolic acid. [Written also glycollide.]
Wiktionary
glycolide
n. (context organic compound English) A lactone formed from two molecules of glycolic acid; any derivative of this compound