peptococcus

noun

pep·​to·​coc·​cus ˌpep-tə-ˈkäk-əs 

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