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Medical Definition of Reticulocytosis
1. An increase in the number of circulating reticulocytes above the normal, which is less than 1% of the total number of red blood cells; it occurs during active blood regeneration (stimulation of red bone marrow) and in certain anaemias, especially congenital haemolytic anaemia. Origin: reticulocyte + G. Osis, condition (05 Mar 2000)