THIOPHENE
Etymology
Noun
thiophene (plural thiophenes)
(organic compound) Any of a class of aromatic heterocyclic compounds containing a ring of four carbon atoms and a sulfur atom; especially the simplest one, C4H4S.
Source: Wiktionary
Thi"o*phene, n. Etym: [Thio- + phenyl + -ene.] (Chem.)
Definition: A sulphur hydrocarbon, C4H4S, analogous to furfuran and
benzene, and acting as the base of a large number of substances which
closely resemble the corresponding aromatic derivatives.
Source: Webster’s Unabridged Dictionary 1913 Edition