pneumocytosis pneu·mo·cy·tosis uncommon noun 1. pneumonia occurring in infants or in persons with impaired immune systems (as AIDS victims) Synonymspneumocystis pneumoniapneumocystis carinii pneumoniainterstitial plasma cell pneumonia Related words Broader terms pneumonia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
