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Definition of: gramicidin
(gram′ə·sīd′n, grə·mis′ə·din) noun Biochem.
A crystalline bacteriostatic and bactericidal substance isolated from an aerobic spore-forming soil bacterium (Bacillus brevis). It is a constituent of tyrothricin and has a powerful selective effect against Gram-positive microorganisms. [<GRAM(-POSITIVE) + -(I)CIDE + -IN]
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