lymphocyte(redirected from activated lymphocyte)
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Any of a class of white blood cells of the vertebrate immune system, including the B cells, T cells, and natural killer cells, that in mammals derive from a common progenitor in the bone marrow and are found chiefly in lymph, lymphoid tissues, and blood.
lym′pho·cyt′ic (-sĭt′ĭk) adj.
a type of white blood cell important in the production of antibodies. Compare B cell (def. 1), T cell.
lym`pho•cyt′ic (-ˈsɪt ɪk) adj.
Any of various white blood cells that function in the body's immune system by recognizing and deactivating specific foreign substances called antigens. Certain lymphocytes (called B cells) act by stimulating the production of antibodies. Others (T cells) contain receptors on their cell surfaces that are capable of recognizing and binding to specific antigens.
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|Noun||1.||lymphocyte - an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection|
lymphatic system, systema lymphaticum - the interconnected system of spaces and vessels between body tissues and organs by which lymph circulates throughout the body
leucocyte, leukocyte, WBC, white blood cell, white blood corpuscle, white cell, white corpuscle - blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system
B cell, B lymphocyte - a lymphocyte derived from bone marrow that provides humoral immunity; it recognizes free antigen molecules in solution and matures into plasma cells that secrete immunoglobulin (antibodies) that inactivate the antigens
T cell, T lymphocyte - a small lymphocyte developed in the thymus; it orchestrates the immune system's response to infected or malignant cells
lymphoblast - an immature lymphocyte