ˌn(y)üməˈsistəs noun
( -es )
Etymology: New Latin, from pneum- + -cystis
1. capitalized : a genus of microorganisms of uncertain affiliation that are usually considered protozoans or sometimes fungi and that include one ( P. carinii ) causing pneumonia especially in immunocompromised individuals
2. usually capitalized : pneumocystis carinii pneumonia herein