Also found in: Thesaurus, Medical, Legal, Financial, Encyclopedia, Wikipedia.
Any of a class of lymphocytes, including the helper T cells and cytotoxic T lymphocytes, that form in bone marrow and mature in the thymus. T cells are activated when receptors on the cell surface recognize specific antigens. Also called T lymphocyte.
any of several closely related lymphocytes, developed in the thymus, that circulate in the blood and lymph and regulate the immune system's response to infected or malignant cells. Also called T lymphocyte.
Any of the lymphocytes that act to defend the body against disease by binding foreign antigens to receptors on the surface of their cells. T cells also regulate the function of B cells.
Switch to new thesaurus
|Noun||1.||T cell - a small lymphocyte developed in the thymus; it orchestrates the immune system's response to infected or malignant cells|
lymph cell, lymphocyte - an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection
CD4 cell, CD4 T cell, helper cell, helper T cell - T cell with CD4 receptor that recognizes antigens on the surface of a virus-infected cell and secretes lymphokines that stimulate B cells and killer T cells; helper T cells are infected and killed by the AIDS virus