cancer of the blood, leucaemia, leukaemia, leukemia - malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer

chronic lymphocytic leukemia - chronic leukemia characterized by lymphoblast-like cells; more common in older men

chronic myelocytic leukemia, myeloid leukemia - chronic leukemia characterized by granular leukocytes; more common in older people