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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