ˈpräntəˌsil noun
( -s )
Etymology: German
: any of three sulfonamide drugs:
a. or prontosil rubrum : a red azo dye H 2 NSO 2 C 6 H 4 N . NC 6 H 3 (NH 2 ) 2 that was the first sulfa drug tested clinically
b. or prontosil album : sulfanilamide
c. or prontosil soluble : azosulfamide