We do not currently know of any antonyms for lymphocyte.
The noun lymphocyte is defined as:
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.
