Pneumocystis
noun
Pneu·mo·cys·tis
ˌn(y)ü-mə-ˈsis-təs
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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Merriam-Webster unabridged
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