cytotoxic T cell
Medical Definition of cytotoxic T cell
: a T cell that usually bears CD8 molecular markers on its surface and that functions in cell-mediated immunity by destroying a cell (as a virus-infected cell) having a specific antigenic molecule on its surface—called also CTL, cytolytic T cell, cytolytic T lymphocyte, killer T cell, killer T lymphocyte; compare helper t cell, suppressor t cell
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