[ lim-fuh-sahy-toh-sis ]
/ ˌlɪm fə saɪˈtoʊ sɪs /
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noun Pathology.

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



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Origin of lymphocytosis

First recorded in 1895–1900; lymphocyte + -osis
lym·pho·cy·tot·ic [lim-foh-sahy-tot-ik], /ˌlɪm foʊ saɪˈtɒt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
  • There is decided decrease of hemoglobin and red corpuscles, with moderate leukopenia and relative lymphocytosis.

    A Manual of Clinical Diagnosis|James Campbell Todd
  • 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

/ (ˌlɪmfəʊsaɪˈtəʊsɪs) /


an abnormally large number of lymphocytes in the blood: often found in diseases such as glandular fever and smallpox
lymphocytotic (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

Medical definitions for lymphocytosis

[ lĭm′fō-sī-tōsĭs ]


A condition marked by an abnormal increase in the number of lymphocytes in the bloodstream, usually resulting from infection or inflammation.lymphocythemia lymphocytic leukocytosis
lym′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.
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