furan

(fyo͝orˈănˌ, fyo͝o-rănˈ)

1. One of a group of colorless, volatile, heterocyclic organic compounds containing a ring of four carbon atoms and one oxygen atom, obtained from wood oils and used in the synthesis of furfural and other organic compounds.
2. The simplest such compound, C₄H₄O. Also called furfuran.