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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-cells are essential for human immunity. The devastating effects of a lower than normal number of just one type of T-cell are all too evident in HIV/AIDS. There are several different kinds of T-cell; broadly speaking they can be divided into two different types, killer T-cells and helper T-cells. Killer T-cells have âX-ray visionâ as they are able to see inside our bodies own cells simply by scanning their surface.