Definition of streptomycin
: an antibiotic organic base C21H39N7O12 that is produced by a soil actinomycete (Streptomyces griseus), is active against many bacteria, and is used especially in the treatment of infections (such as tuberculosis) by gram-negative bacteria
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Merriam-Webster unabridged
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Time Traveler for streptomycin
The first known use of streptomycin was in 1944
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