-mycin Definition
 mīsin 
    suffix
  
 A substance derived from a bacterium in the order Actinomycetales.
 Neomycin.
 American Heritage 
    affix
  
 A substance, esp. an antibiotic, derived from a fungus.
 Erythromycin.
 Webster's New World 
Origin of -mycin
myc(o)– (so called because the bacteria from which the substances were first derived were originally mistaken for fungi) –in
From American Heritage Dictionary of the English Language, 5th Edition
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