pep·to·coc·cus | \ ˌpep-tə-ˈkäk-əs 
\
\Medical Definition of peptococcus
1 capitalized : a genus of anaerobic gram-positive coccal bacteria that do not form spores and are now considered to comprise a single species (P. niger)
2 plural peptococci\ -ˈkäk-ˌ(s)ī \ : any bacterium of the genus Peptococcus
\ : any bacterium of the genus PeptococcusComments on peptococcus
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