sulphaˈsalazinen. [sal- (in salicyln.) + azinen.] the sulphonamide C5H4N·NH·SO2·C6H4·N:N·C6H(OH)COOH, which is used in conjunction with corticosteroids in the treatment of ulcerative colitis; 4-hydroxy-4′-(2-pyridylsulphamoyl)azobenzene-3-carboxylic acid.