sulfisoxazole
noun
sul·fi·sox·a·zole
variants:
or chiefly British sulphisoxazole \ ˌsəl-fə-ˈsäk-sə-ˌzōl 
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Medical Definition of sulfisoxazole
: a sulfa drug C11H13N3O3S derived from sulfanilamide that is less likely than other sulfanilamide derivatives to produce renal damage because of its greater solubility