Definition of polycythemia vera
: polycythemia of unknown cause that is marked by increase in total blood volume and accompanied by nosebleed, distension of the circulatory vessels, and enlargement of the spleen
— called also erythremia
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Merriam-Webster unabridged
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Time Traveler for polycythemia vera
The first known use of polycythemia vera was circa 1925
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