Definition of pneumococcus
plural pneu·mo·coc·ciplay \-ˈkäk-ˌsī, -ˌsē; -ˈkä-ˌkī, -ˌkē\
: a bacterium (Streptococcus pneumoniae) that causes an acute pneumonia involving one or more lobes of the lung
Origin of pneumococcus
First Known Use: 1890
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