| sulfonic acid n. Any of several organic acids containing one or more sulfonic groups. |
sulfonic acid (s l-f n  k) Any of several acids containing the group SO3H attached to an organic radical. Sulfonic acids and their salts are important in industry as catalysts in organic synthesis and in making sulfonamide drugs, detergents, and dyes. |
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| Noun | 1. | sulfonic acid - an acid derived from sulphuric acid acid - any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt |
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