D defs.my
Entry 1 sense Webster, 1913

Thionaphthene

· Thi·o·naph·thene · IPA
01 n. A double benzene and thiophene nucleus, C8H6S, analogous to naphthalene, and like it the base of a large series of derivatives.
  1. 1.
    A double benzene and thiophene nucleus, C8H6S, analogous to naphthalene, and like it the base of a large series of derivatives.(Chem.)