Medical Dictionary
prontosil
noun pron·to·sil \ˈprän-tə-ˌsil\
Medical Definition of PRONTOSIL
: any of three sulfonamide drugs: a : a red azo dye C12H13N5O2S that was the first sulfa drug tested clinically—called also prontosil rubrum b : sulfanilamide c : azosulfamide
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