noun \ˌn(y)ü-mə-ˈkäk-əs\
plural pneu·mo·coc·ci \-ˈkäk-ˌ(s)ī\

Definition of PNEUMOCOCCUS

: a bacterium of the genus Streptococcus (S. pneumoniae) that causes an acute pneumonia involving one or more lobes of the lung

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