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trisulphonic
trisulphonic adj. 
/traɪsʌlˈfɒnɪk/ in trisulphonic acid, trisulphone amide, trisulphone chloride, etc., compounds of three SO2.OH, SO2.NH2, SO2.Cl, etc., groups with a trivalent element or radical, the sulphur being directly joined to the element or carbon of the radical; e.g. amine-trisulphonic acid, N(SO2.OH)3; benzene-trisulphonic acid, C6H3(SO2.OH)3; benzene-trisulphonic chloride, C6H3(SO2Cl)3.
/traɪsʌlˈfɒnɪk/ in trisulphonic acid, trisulphone amide, trisulphone chloride, etc., compounds of three SO2.OH, SO2.NH2, SO2.Cl, etc., groups with a trivalent element or radical, the sulphur being directly joined to the element or carbon of the radical; e.g. amine-trisulphonic acid, N(SO2.OH)3; benzene-trisulphonic acid, C6H3(SO2.OH)3; benzene-trisulphonic chloride, C6H3(SO2Cl)3.ΘΚΠ
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sulphuric1815
trisulphonic1874
1874 C. Schorlemmer Man. Chem. Carbon Compounds 199 A series of sulphonic acids..substitution products of marsh gas,..the third is methenyltrisulphonic acid, CH(SO3H)3.
1879 H. Watts Dict. Chem. VIII. i. 259 Benzenetrisulphonic acid, C6H3(SO3H)3+3H2O, crystallises in long flat deliquescent needles.
1886 Jrnl. Chem. Soc. 50 623 Benzenetrisulphonic chloride melts at 184°; the amide melts at 306°.
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