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New American Oxford Dictionary

Prontosil

Prontosil |ˈprɒntəsɪl | ▶noun [ mass noun ] Medicine, historical the first sulphonamide antibiotic, a reddish-brown crystalline pigment formerly used to treat a range of infections. ORIGIN 1930s: from German, an invented proprietary name.

 

Oxford Dictionary

Prontosil

Prontosil |ˈprɒntəsɪl | ▶noun [ mass noun ] Medicine, historical the first sulphonamide antibiotic, a reddish-brown crystalline pigment formerly used to treat a range of infections. ORIGIN 1930s: from German, an invented proprietary name.