Thiophthene
Pronunciation : Thi*oph"thene
Part of Speech : n.
Etymology : [Abbreviated from thionaphthene.] (Chem.)
Definition : Defn: A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds. [Written also thiophtene.]
Source : Webster's Unabridged Dictionary, 1913