The story
From vanquish + -o- + -mycin (“antibiotic produced by a Streptomyces strain”).
Etymology from Wiktionary, CC BY-SA 4.0.
vancomycin
Today it means: A glycopeptide antibiotic C₆₆H₇₅Cl₂N₉O₂₄ produced by the actinomycete Amycolaptosis orientalis, used in the form of its hydrochloride C₆₆H₇₅Cl₂N₉O₂₄·HCl against Gram-positive bacteria, especially staphylococci resistant to meticillin and enterococci. Full definition →