1. The presence of black, pigmentary masses in the blood; as in, hemochromatosis (pathology in which iron accumulates in the tissues; characterized by bronzed skin and enlarged liver and diabetes mellitus (a chronic disease associated with abnormally high levels of the sugar glucose in the blood) and abnormalities of the pancreas and the joints).
2. A morbid condition in which the blood contains black pigment either floating freely or imbedded in the white blood corpuscles.