t cells

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Definition of t cells in English English dictionary: plural form of T cell
T cell: A lymphocyte, from the thymus, that can recognise specific antigens and can activate or deactivate other immune cells
T cell: Any of the lymphocytes that mature in the thymus and have the ability to recognize specific peptide antigens through the receptors on their cell surface. Also called T lymphocyte. a type of white blood cell that helps the body fight disease (T from thymus-derived). With the B cell, one of the two main types of white blood cell, essential parts of the immune system. T cells originate in the bone marrow, mature in the thymus, and travel in the blood to other lymphoid tissues, such as the spleen, tonsils, and lymph nodes. Through receptor molecules on their surfaces, T cells directly attack invaders (antigens) by binding to them and helping remove them from the body. Because the body contains millions of T and B cells, many of which carry unique receptors, it can respond to virtually any antigen. See also antibody, immunology
t cell: a small lymphocyte developed in the thymus; it orchestrates the immune system's response to infected or malignant cells