lymphocyte

Any of the nearly colorless cells found in the blood, lymph, and lymphoid tissues, constituting approximately 25 percent of white blood cells in humans and including B cells, which function in humoral immunity, and T cells, which function in cellular immunity.

A typo of leucocyte found in the blood of all vertebrate animals. It is colored blue or purple with Ehrlich’s triple stain, and occurs, in man, normally in the proportion of about 30 per cent. of the entire number of white blood-cells. There are two varieties, the large (11 to 14 microns in diameter), and the small (7.5 microns in diameter), the latter being the more numerous.

A type of white blood cell or leukocyte that is divided into two principal groups and a null group; B-lymphocytes, which produce antibodies in the humoral immune response, T-lymphocytes, which participate in the cell-mediated immune response and the null group, which contains natural killer cells, cytotoxic cells that participate in the innate immune response.

an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection