n :  a basic antibiotic C₁₉H₃₄N₈O₈ that is produced by a soil actinomycete of the genus Streptomyces (S. lavendulae) and is active esp. against bacteria : also  :  any of several related antibiotics .
 
   
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.