The Collaborative International Dictionary
Thiophthene
Thiophthene \Thi*oph"thene\, n. [Abbreviated from thionaphthene.] (Chem.) A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds.
Wiktionary
thiophthene
n. (context chemistry English) A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds.