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erythromycin, Erythrocin, E-Mycin, Ethril, Ilosone, Pediamycin | 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 |