a type of white blood cell that matures in the thymus and carries out the cell-mediated immune response. Three major types of T-cells are helper (CD4) T-cells, suppressor (CD8) T-cells, and killer (CD8) T-cells (cytotoxic T-lymphocytes or CTLs). Contrast with B-cell.
lymphocyte "born" in the thymus
T-cells received their name from the “t” in thymus, a gland in the chest that shrinks and disappears as people grow into adulthood. These cells are critical to a variety of immune functions. Uncontrolled proliferation after the malignant transformation of this type of cell gives rise to T-cell lymphoma.