noun Pathology.

an abnormal increase in the number of lymphocytes in the blood.

Origin of lymphocytosis

First recorded in 1895–1900; lymphocyte + -osis
Related formslym·pho·cy·tot·ic [lim-foh-sahy-tot-ik] /ˌlɪm foʊ saɪˈtɒt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for lymphocytosis

Historical Examples of lymphocytosis

  • Only one single substance has so far been mentioned in the literature as capable in itself of producing a lymphocytosis.

  • Doubtless in these cases also the lymphocytosis is due to the stimulation and swelling of the tracheobronchial glands.

British Dictionary definitions for lymphocytosis



an abnormally large number of lymphocytes in the blood: often found in diseases such as glandular fever and smallpox
Derived Formslymphocytotic (ˌlɪmfəʊsaɪˈtɒtɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

lymphocytosis in Medicine




A condition marked by an abnormal increase in the number of lymphocytes in the bloodstream, usually resulting from infection or inflammation.lymphocythemia lymphocytic leukocytosis
Related formslym′pho•cy•totic (-tŏtĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.