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Noun. 1. cytotoxic T cell-T cell with CD8 receptor that recognizes antigens on the surface of a virus-infected cell and binds to the infected cell and kill it. CD8 cell, CD8 T cell, killer cell, killer T cell. T cell, T lymphocyte-a small lymphocyte developed in the thymus; it orchestrates the immune system's response to infected or malignant cells.
T cell. Definition. noun, plural: T cells. A type of white blood cell that functions in cell-mediated immunity, and is distinguished from other types of lymphocytes by the presence of special receptor (T cell receptor) on the cell surface. Supplement. The T in T cell stands for thymus. The thymus is the bodily organ where T cells mature.