T cell

noun Immunology.

any of several closely related lymphocytes, developed in the thymus, that circulate in the blood and lymph and orchestrate the immune system's response to infected or malignant cells, either by lymphokine secretions or by direct contact: helper T cells recognize foreign antigen on the surfaces of other cells, then they stimulate B cells to produce antibody and signal killer T cells to destroy the antigen-displaying cells; subsequently suppressor T cells return the immune system to normal by inactivating the B cells and killer T cells.

Origin of T cell

1965–70; T(hymus-derived)

Also called T lymphocyte.

Definition for t-lymphocyte (2 of 2)

T lymphocyte

noun Immunology.

T cell.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for t-lymphocyte

T-lymphocyte

noun

a type of lymphocyte that matures in the thymus gland and has an important role in the immune response. There are several subclasses: killer T-cells are responsible for killing cells that are infected by a virus; helper T-cells induce other cells (B-lymphocytes) to produce antibodiesAlso called: T-cell

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for t-lymphocyte (1 of 2)

T cell

n.

A principal type of white blood cell that completes maturation in the thymus and that has various roles in the immune system, including the identification of specific foreign antigens in the body and the activation and deactivation of other immune cells.T lymphocyte

Medical definitions for t-lymphocyte (2 of 2)

T lymphocyte

n.

T cell

Scientific definitions for t-lymphocyte (1 of 2)

T lymphocyte

See T cell.

Scientific definitions for t-lymphocyte (2 of 2)

T cell

Any of the lymphocytes that develop in the thymus gland and that act in the immune system by binding antigens to receptors on the surface of their cells in what is called the cell-mediated immune response. T cells are also involved in the regulation of the function of B cells. Also called T lymphocyte See more at cell-mediated immune response. Compare B cell.