a yellowish-brown protein containing iron, derived chiefly from hemoglobin and found in body tissue and phagocytes, esp. as the result of disorders in iron metabolism and the breakdown of red blood cells.
Main Entry: he·mo·sid·er·in Variant: or chiefly Britishhae·mo·sid·er·in/"hE-mO-'sid-&-r&n/ Function: noun : a yellowish brown granular pigment formed by breakdown of hemoglobin, found in phagocytes and in tissues especially in disturbances of iron metabolism (as inhemochromatosis, hemosiderosis, or some anemias), and composed essentially of colloidal ferric oxide —compare FERRITIN
hemosiderin he·mo·sid·er·in (hē'mō-sĭd'ər-ĭn) n. An insoluble protein that contains iron and that is produced by phagocytic digestion of hematin and found as granules in most tissues, especially in the liver.