Definition of diplococcus
plural diplococci
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\-ˈkäk-ˌsī, -ˌsē, -ˈkä-ˌkī, -ˌkē\
:any of various encapsulated bacteria (such as Streptococcus pneumoniae, a common cause of pneumonia) that usually occur in pairs and that were formerly grouped in a single taxon (genus Diplococcus) but are now all assigned to other genera
