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A substance obtained from the bacterium Bacillus brevis, composed chiefly of the polypeptide antibiotics tryocidine and gramicidin and used for topical treatment of infections caused by gram-positive bacteria.

[New Latin Tȳrothrix, former bacteria genus name (Greek tūros, cheese; see teuə- in the Appendix of Indo-European roots + Greek thrix, trikh-, hair, of unknown origin ) + -in.]


(Pharmacology) an antibiotic, obtained from the soil bacterium Bacillus brevis, consisting of tyrocidine and gramicidin and active against Gram-positive bacteria such as staphylococci and streptococci: applied locally for the treatment of ulcers and abscesses
[C20: from New Latin Tyrothrix (genus name), from Greek turos cheese + thrix hair]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tyrothricin - a mixture of antibiotics applied locally to infections caused by Gram-positive bacteria
antibiotic, antibiotic drug - a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections; "when antibiotics were first discovered they were called wonder drugs"
tyrocidin, tyrocidine - a basic polypeptide antibiotic derived from a soil bacterium; a major component of tyrothricin
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References in periodicals archive ?
tyrothricin and its salts (antibiotic substances with a bacteriostatic effect).
American bacteriologist Rene Dubos first used an antibiotic, tyrothricin, successfully in the treatment of human disease in 1939.
Dubos's discovery of tyrothricin (see 1939) had galvanized one of his past teachers, the Russian-born American microbiologist Selman Abraham Waksman (1888-1973).