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gram·i·ci·din | \ ˌgra-mə-ˈsī-dᵊn 
\
\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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gramicidin
noungram·i·ci·din | \ ˌgram-ə-ˈsīd-ᵊn \
\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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Time Traveler for gramicidin
The first known use of gramicidin was in 1940
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