thiophthene

Century Dictionary and Cyclopedia

1. n. A colorless liquid, , prepared by the distillation of citric acid with phosphorus trisulphid. It boils at 224–226° C.

Wiktionary

1. n. chemistry A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds.

GNU Webster's 1913

1. n. (Chem.) A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds.