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
Cite this Entry
“Pneumocystis.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Pneumocystis. Accessed 30 Oct. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share