Definition of gramicidin
: any of several toxic crystalline polypeptide antibiotics produced by a soil bacterium (Bacillus brevis) and used against gram-positive bacteria in local infections
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Origin and Etymology of gramicidin
Medical Dictionary
medical Definition of gramicidin
: an antibacterial mixture produced by a soil bacterium of the genus Bacillus (B. brevis) and used topically against gram-positive bacteria in local infections especially of the eye
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Britannica.com: Encyclopedia article about gramicidin
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