erythromycin

noun2

1. •
   An antibiotic similar to penicillin, used for the treatment of a number of bacterial infections.
2. •
   A broad-spectrum macrolide antibiotic C₃₇H₆₇NO₁₃ produced by an actinomycete Saccharopolyspora erythraea (formerly Streptomyces erythreus) and similar in its effects to penicillin, administered orally or topically in the treatment of infections caused by Gram-positive bacteria.