leukemia

n. type of cancer of the bone marrow in which there is an excessive production of white blood cells

Leukemia or leukaemia (Greek leukos, “white”; haima, “blood”) (see spelling differences) is a cancer of the blood or bone marrow and is characterized by an abnormal proliferation (production by multiplication) of blood cells, usually white blood cells (leukocytes). It is part of the broad group of diseases called hematological neoplasms.
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Leukemia /leu·ke·mia/ a progressive, malignant disease of the blood-forming organs, marked by distorted proliferation and development of leukocytes [more]Leukemia - Community and Resources

Noun
1. malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer
(synonym) leukaemia, leucaemia, cancer of the blood
(hypernym) cancer, malignant neoplastic disease
(hyponym) acute leukemia

Cancer of the blood cells.

Refers to chronic myelogenous leukemia that is progressing. The number of immature, abnormal white blood cells in the bone marrow and blood is higher than in the chronic phase, but not as high as in the blast phase.

Cancer of the blood cells (leukemia) that characteristically comes on abruptly and (if not treated) progresses rapidly.