reticuloendothelial system

noun

, Immunology.

1. the aggregate of the phagocytic cells, including certain cells of the bone marrow, lymphatic system, liver, and spleen, that have reticular and endothelial characteristics and function in the immune system's defense against foreign bodies. : RES

Word History and Origins

Origin of reticuloendothelial system¹

First recorded in 1920–25