T cell

noun

Definition of T cell

  1. :  any of several lymphocytes (such as a helper T cell) that differentiate in the thymus, possess highly specific cell-surface antigen receptors, and include some that control the initiation or suppression of cell-mediated and humoral immunity (as by the regulation of T and B cell maturation and proliferation) and others that lyse antigen-bearing cells :  t lymphocyte The immature lymphoid cell, in turn, can be processed into a B cell, which makes infection-fighting antibodies, or a T cell, which recognizes foreign tissue and virally infected cells and directs the activities of the rest of the immune system. — Gina Kolata T cells recognize antigen only in association with cell surface molecules encoded by the major histocompatibility complex … — Miranda Robertson — see helper t cell, killer t cell — compare b cell

Origin and Etymology of t cell

thymus-derived cell


First Known Use: 1970


Medical Dictionary

T cell

noun

Medical Definition of T cell

  1. :  any of several lymphocytes (as a helper T cell) that differentiate in the thymus, possess highly specific cell-surface antigen receptors, and include some that control the initiation or suppression of cell-mediated and humoral immunity (as by the regulation of T and B cell maturation and proliferation) and others that lyse antigen-bearing cells—called also T lymphocyte; see cytotoxic t cell, helper t cell, suppressor t cell, t4 cell


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