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]

WordNet (r) 3.0 (2006):

furfuran
    n 1: a colorless toxic flammable liquid used in the synthesis of
         nylon [syn: furan, furane, furfuran]