Pneumocystis

noun
Pneu·mo·cys·tis | \ ˌn(y)ü-mə-ˈsis-təs \

Medical Definition of Pneumocystis 

1 : a genus of ascomycetous fungi that were formerly classified as protozoans and include one (P. carinii synonym P. jiroveci) causing pneumonia especially in immunocompromised individuals

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