Lymphocyte
WordNet
noun
(1) An agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection
WiktionaryText
Noun
- A type of white blood cell or leukocyte that occurs in two forms; B-lymphocytes, which produce antibodies in the humoral immune response, and T-lymphocytes, which participates in the cell-mediated immune response.