Thionaphthene
Pronunciation : Thi`o*naph"thene
Part of Speech : n.
Etymology : [Thiophene + naphthalene.] (Chem.)
Definition : Defn: A double benzene and thiophene nucleus, C8H6S, analogous to naphthalene, and like it the base of a large series of derivatives. [Written also thionaphtene.]
Source : Webster's Unabridged Dictionary, 1913