reticuloendotheliosis

noun

re·​tic·​u·​lo·​en·​do·​the·​li·​o·​sis -ˌthē-lē-ˈō-səs 

plural reticuloendothelioses -ˌsēz 

: any of several disorders characterized by proliferation of phagocytic cells (as macrophages)

called also reticulosis