WordReference Random House Unabridged Dictionary of American English © 2026
sulfon′ic ac′id, [Chem.]
  1. Chemistryany of a large group of organic compounds of the structure RSO2OH, which are strong acids that give neutral sodium salts: used in the synthesis of phenols, dyes, and other substances.
  • 1870–75

'sulfonic acid' also found in these entries (note: many are not synonyms or translations):
benzenesulfonic acid - chlorosulfonic acid - sulfonate - sulfonation

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