Definitions for t cell
Random House Webster's College Dictionary
any of several closely related lymphocytes, developed in the thymus, that circulate in the blood and lymph and regulate the immune system's response to infected or malignant cells.
Ref: Also called T lymphocyte.
Origin of T cell:
T cell, T lymphocyte(noun)
a small lymphocyte developed in the thymus; it orchestrates the immune system's response to infected or malignant cells
A lymphocyte, from the thymus, that can recognise specific antigens and can activate or deactivate other immune cells.