An antibiotic produced by soil bacteria that kills or inhibits the growth of many bacteria, used medically in creams and ointments.
From the bacteria 'Bacillus brevis' which produces it, with 'gram-' relating to Gram-positive bacteria classification, plus '-cidin' (killer). Named through modern pharmaceutical Latin conventions.
Gramicidin was one of the first antibiotics discovered before penicillin became famous—it comes from literal garden soil bacteria, showing that nature had developed chemical warfare long before humans!
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