Chem. [f. SULPH- + OXIDE.] Any compound containing a hydrocarbon radical combined with the group SO.
1894. Muir & Morley, Watts’ Dict. Chem., Sulphoxides, organic compounds R.SO.R′ formed by the action of conc. HNO3 on sulphides. Ibid., s.v., Sulphoxides containing monovalent alcohol radicles form unstable compounds with HNO3.
