D defs.my
Entry 1 sense Webster, 1913

Sulphonic

· Sul·phon·ic · IPA
01 a. Pertaining to, or derived from, a sulphone; -- used specifically to designate any one of a series of acids (regarded as acid ethereal salts…
  1. 1.
    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.(Chem.)
Phrases & compounds
Sulphonic group — the hypothetical radical, SO2.OH, the characteristic residue of sulphonic acids.