An abnormal increase in the number of circulating red blood cells.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for erythrocytosis
Historical Examples of erythrocytosis
Again, a marked concentration of the blood, shown by erythrocytosis and leucocytosis, indicates starvation.The Ethics of Medical Homicide and Mutilation