- sulfonic acid
- Any of the compounds in which a hydrogen atom of a CH group is replaced by the s. group, –SO3H; general formula : R–SO3H. SYN: sulfoacid (2).
* * *sulfonic acid n any of numerous acids that contain the SO3H group and may be derived from sulfuric acid by replacement of a hydroxyl group by either an inorganic anion or a monovalent organic group
* * *sul·fon·ic ac·id (səl-fonґik) an organic compound having the formula RSO2OH; used in synthesizing dyes and phenols.
Medical dictionary. 2011.