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Definition of Pleocytosis
1. Noun. A condition where an unusually high quantity of white blood cells (normally lymphocytes) are present in the cerebrospinal fluid ¹
¹ Source: wiktionary.com
Medical Definition of Pleocytosis
1. Presence of more cells than normal, often denoting leukocytosis and especially lymphocytosis or round cell infiltration; orginally applied to the lymphocytosis of the cerebrospinal fluid present in syphilis of the central nervous system. Origin: pleo-+ G. Kytos, cell, + -osis, condition (05 Mar 2000)