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• ERYTHROMYCIN (noun) The noun ERYTHROMYCIN has 1 sense: 1. an antibiotic (trade name Erythrocin or E-Mycin or Ethril or Ilosone or Pediamycin) obtained from the actinomycete Streptomyces erythreus; effective against many Gram-positive bacteria and some Gram-negative Familiarity information: ERYTHROMYCIN used as a noun is very rare.
