sulfoacid
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sulfoacid — noun sulfonic acid … Wiktionary
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 … Medical dictionary
thioacid — An organic acid in which one or more of the oxygen atoms have been replaced by sulfur atoms; e.g., thiosulfuric acid. SYN: sulfacid, sulfoacid (1) … Medical dictionary