1. Compounds having the structure RSR (RH). Such compounds were once called thioethers.
    See also: thioacetals
    PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1368 (
  2. In an inorganic sense, salts or other derivatives of hydrogen sulfide.
  3. A term used in additive nomenclature, see imides (2).