Leukemia, lymphocytic: Cancer of blood cells that are precursors of lymphocytes. The two major types of lymphocytic leukemia are acute lymphoblastic leukemia (ALL) and chronic lymphocytic leukemia (CML). Also known as lymphoid leukemia. SLIDESHOW Signs of Cancer in Men: Could it Be Cancer? See Slideshow From Cancer Resources Chronic Lymphocytic Leukemia ExplainedMantle Cell Lymphoma: What to ExpectWhat Is Chronic Lymphocytic Leukemia? Featured Centers Good and Bad Foods for PsoriasisVideo: Getting Personal on Life With MS Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19