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T Cell ['tiːˌsel]
med. A type of lymphocyte. There are two major types of T lymphocytes: CD8 cells cytotoxic T lymphocytes and CD4 cells helper T lymphocytes; both T cell types are essential for a healthy immune system. HIV infects and destroys CD4 cells, gradually destroying the immune system. see also CD4 T lymphocyte, CD8 T lymphocyte, lymphocyte