ˌsəlˈfäkˌsīd, -ksə̇d noun
Etymology: International Scientific Vocabulary sulf- + oxide
: any of a class of organic compounds that are characterized by the sulfinyl group doubly united by means of its sulfur with carbon (as with two hydrocarbon radicals or a single bivalent radical), that are usually made by oxidation of organic sulfides, and that yield sulfones on further oxidation