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Definition of Sulphonic
1. a. Pertaining to, or derived from, a sulphone; -- used specifically to designate any one of a series of acids (regarded as acid ethereal salts of sulphurous acid) obtained by the oxidation of the mercaptans, or by treating sulphuric acid with certain aromatic bases (as benzene); as, phenyl sulphonic acid, C6H5.SO2.OH, a stable colorless crystalline substance.
Definition of Sulphonic
1. Adjective. (alternative spelling of sulfonic) ¹
¹ Source: wiktionary.com