lymphocytic leukemia cell BTO:0000744 BrendaTissueOBO Leukemia cell of either of two types marked by an abnormal increase in the number of white blood cells (as lymphocytes) which accumulate in bone marrow, lymphoid tissue (as of the lymph nodes and spleen), and circulating blood. leukemia cell, lymphocytic lymphatic leukemia cell lymphoid leukemia cell leukemia cell