tetrahydrofuranPronunciation: /ˌtɛtrəˌhʌɪdrəʊˈfjʊəran/Definition of tetrahydrofuran noun [mass noun] Chemistry a colourless liquid used chiefly as a solvent for plastics and as an intermediate in organic syntheses. A heterocyclic compound; chemical formula: C4H8O tetrahydrofuran in other Oxford dictionaries Definition of tetrahydrofuran in the US English dictionary