any of a group of neoplastic diseases of the blood-forming organs, resulting in an abnormal increase in the production of leukocytes, often accompanied by anemia and enlargement of the lymph nodes, spleen, and liver
Any of various acute or chronic neoplastic diseases of the bone marrow in which unrestrained proliferation of white blood cells occurs, usually accompanied by anemia, impaired blood clotting, and enlargement of the lymph nodes, liver, and spleen.