Phys. [f. LYMPHOCYTE + -OSIS.] A morbid increase in the number of lymphocytes.
1896. Allbutts Syst. Med., I. 730. In the lymphocytosis he sees a prognostic sign of great value.
1900. Allchins Man. Med., II. 291. The lymphocytes are generally increased to the greatest extent (lymphocytosis).