| sulfonium compounds | Sulfur compounds in which the sulfur atom is attached to three organic radicals and an electronegative element or radical. (12 Dec 1998) |
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| sulfonium ion | A compound in which a sulfur atom has three single covalent bonds and therefore has a positive charge analogous to the nitrogen of an ammonium compound; e.g., S-adenosyl-l-methionine. (05 Mar 2000) |
| sulfonium salts | Compounds containing sulfur covalently linked to three moieties; e.g., RS+(R')R''', such as S-adenosyl-l-methionine. (05 Mar 2000) |