polycythemia

[pŏl′ē-sī-thēmē-ə]
n.
  1. A condition characterized by an abnormal increase in the number of red blood cells in the blood.erythrocythemia hypercythemia hypererythrocythemia hyperglobulia
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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Historical Examples of polycythemia