leukemia Definition

an acute or chronic disease in humans and other warm-blooded animals characterized by an abnormal increase in the number of white blood cells in the tissues and often in the blood

a chronic leukemia that is usually of B cell origin and is characterized by malignant cells with a ciliated appearance

leukemia of either of two types marked by an abnormal increase in the number of white blood cells (such as lymphocytes) which accumulate especially in bone marrow, lymphoid tissue, and circulating blood —called also lymphatic leukemia

leukemia characterized by proliferation of myeloid tissue (as of the bone marrow and spleen) and an abnormal increase in the number of granulocytes, myelocytes, and myeloblasts in the circulating blood —called also myelocytic leukemia, myeloid leukemia