mononuclear phagocyte system n a system of cells comprising all free and fixed macrophages together with their ancestral cells including monocytes and their precursors in the bone marrow compare RETICULOENDOTHELIAL SYSTEM
* * *
(MPS) the collection of cells consisting of macrophages and their precursors (blood monocytes and their precursor cells in bone marrow). The term has been proposed as a replacement for reticuloendothelial system, which does not include all macrophages and does include other unrelated cell types. Called also macrophage s. See also macrophage.Medical dictionary. 2011.