azithromycin

noun
azith·​ro·​my·​cin | \ ə-ˌzith-rō-ˈmīs-ᵊn How to pronounce azithromycin (audio) \

Medical Definition of azithromycin

: a semisynthetic macrolide antibiotic C38H72N2O12 that is derived from erythromycin and is used especially as an antibacterial agent — see zithromax, z-pak