prontosil

noun

pron·to·sil | \ ˈprän-tə-ˌsil

How to pronounce prontosil (audio)

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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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