thiophen

/ ˈθaɪəʊˌfɛn, ˈθaɪəʊˌfiːn /

noun

1. Also called: thiofuran. a colourless liquid heterocyclic compound found in the benzene fraction of coal tar and manufactured from butane and sulphur. It has an odour resembling that of benzene and is used as a solvent and in the manufacture of dyes, pharmaceuticals, and resins. Formula: C 4 H 4 S