tyrothricin
noun
ty·ro·thri·cin ˌtī-rə-ˈthrī-sᵊn 
: an antibiotic mixture consisting chiefly of tyrocidine and gramicidin and used topically especially against gram-positive bacteria
Word History
Etymology
New Latin Tyrothoric-, Tyrothrix, genus name formerly applied to various bacteria
First Known Use
1940, in the meaning defined above
Medical Definition
tyrothricin
noun
ty·ro·thri·cin ˌtī-rə-ˈthrīs-ᵊn
: an antibiotic mixture that consists chiefly of tyrocidine and gramicidin, is obtained from a soil bacterium of the genus Bacillus (B. brevis), and is used in the topical treatment of infections especially of the skin and mouth caused by gram-positive bacteria