Sulphonic

[Sarah]

Pertaining to, or derived from, a sulphone; -- usedspecifically to designate any one of a series of acids (regarded asacid ethereal salts of sulphurous acid) obtained by the oxidation ofthe mercaptans, or by treating sulphuric acid with certain aromaticbases (as benzene); as, phenyl sulphonic acid, C6H5.SO2.OH, a stablecolorless crystalline substance. Sulphonic group (Chem.), thehypothetical radical, SO2.OH, the characteristic residue of sulphonicacids.