ty·​ro·​thri·​cin ˌtī-rə-ˈthrī-sᵊn How to pronounce tyrothricin (audio)
: an antibiotic mixture consisting chiefly of tyrocidine and gramicidin and used topically especially against gram-positive bacteria

Word History


New Latin Tyrothoric-, Tyrothrix, genus name formerly applied to various bacteria

First Known Use

1940, in the meaning defined above

Time Traveler
The first known use of tyrothricin was in 1940

Dictionary Entries Near tyrothricin

Cite this Entry

“Tyrothricin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tyrothricin. Accessed 20 May. 2024.

Medical Definition


ty·​ro·​thri·​cin ˌtī-rə-ˈthrīs-ᵊn How to pronounce tyrothricin (audio)
: 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

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