Leukemia (noun)

1. A cancer of the blood-forming tissues, characterized by an abnormal increase in the number of white blood cells.
2. A malignant progressive disease in which the bone marrow and other blood-forming organs produce increased numbers of immature or abnormal leukocytes.
3. A type of cancer that affects the blood cells and the bone marrow.

Origin:

Derived from greek 'leukos' meaning 'white' and 'haima' meaning 'blood'. first recorded in english in the late 19th century.

Examples:

1. The young girl was diagnosed with acute lymphoblastic leukemia.
2. Leukemia is a serious illness that requires prompt medical treatment.
3. The patient underwent several rounds of chemotherapy to treat his leukemia.
4. Leukemia can be caused by exposure to certain chemicals or radiation.
5. The leukemia research center was dedicated to finding new treatments for this deadly disease.