The Collaborative International Dictionary of English v.0.48:

Furfuran \Fur"fu*ran\, n. [L. furfur bran.] (Chem.)
   A colorless, oily substance, C4H4O, obtained by distilling
   certain organic substances, as pine wood, salts of pyromucic
   acid, etc.; -- called also tetraphenol.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Glycolide \Gly"co*lide\, n. [Glycol + anhydride.] (Chem.)
   A white amorphous powder, C4H4O, obtained by heating and
   dehydrating glycolic acid. [Written also glycollide.]
   [1913 Webster]