erythromycin

eryth·ro·my·cin

noun \i-ˌrith-rə-ˈmīs-^ən\

Definition of ERYTHROMYCIN

: a broad-spectrum antibiotic C₃₇H₆₇NO₁₃ that is produced by a bacterium of the genus Streptomyces (S. erythreus), resembles penicillin in antibacterial activity, and is effective also against amebas, treponemata, and pinworms; also : a preparation of the salt (as the estolate or stearate) of erythromycin—see ilosone, ilotycin