ty·ro·thri·cin 
(tī′rō-thrīsĭn)
(tī′rō-thrīsĭn)n.
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.]