
1) Blood disease 2) Blood disorder
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https://www.crosswordclues.com/clue/polycythemia

Polycythemia (also known as polycythaemia or polyglobulia) is a disease state in which the proportion of blood volume that is occupied by red blood cells increases. Blood volume proportions can be measured as hematocrit level. It can be due to an increase in the number of red blood cells (`absolute polycythemia`) or to a decrease in the volume o.....
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http://en.wikipedia.org/wiki/Polycythemia

abnormal increase in red blood cells and hemoglobin in the circulation, a situation that results in thickened blood, retarded flow, and an increased ... [3 related articles]
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http://www.britannica.com/eb/a-z/p/89

The opposite of anaemia. Too many red blood cells. Polycythemia formally exists when the haemoglobin, red blood cell count, and total rbc volume are all above normal. ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973

(pol″e-si-the´me-ә) an increase in the total red blood cell mass of the blood; the two main types are polycythemia vera and secondary polycythemia. The increased production of red cells results in thickening of the blood and an increased tendency for it to clot. It becomes thicker and less able to flow prope...
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http://www.encyclo.co.uk/local/21001

Increase in the haemoglobin content of the blood, either because of a reduction in plasma volume or an increase in red cell numbers. The latter may be a result of abnormal proliferation of red cell precursors (polycythemia vera, Vaquez-Osler disease).
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Type: Term Pronunciation: pol′ē-sī-thē′mē-ă Synonyms: hypercythemia, erythrocythemia
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http://www.medilexicon.com/medicaldictionary.php?t=70845

Polycythemia: Too many red blood cells. The opposite of anemia. Polycythemia formally exists when the hemoglobin, red blood cell (RBC) count, and total RBC volume are all above normal.
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http://www.medterms.com/script/main/art.asp?articlekey=4982

An excessive number of red blood cells.
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http://www.thehorse.com/Glossary.xhtml?L=P

[
n] - a disorder characterized by an abnormal increase in the number of red blood cells in the blood
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http://www.webdictionary.co.uk/definition.php?query=polycythemia

polycythemia 1. A disorder characterized by an abnormal increase in the number of red blood cells in the blood. 2. Too many red blood cells which is the opposite of anemia. Polycythemia formally exists when the hemoglobin, red blood cell count, and the total volume are all above normal.
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http://www.wordinfo.info/words/index/info/view_unit/721/4
noun a disorder characterized by an abnormal increase in the number of red blood cells in the blood
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https://www.encyclo.co.uk/local/20974

Polycythemia is an increased number of circulating RBC. Most animals with increased PCV have relative polycythemia due to hemoconcentration. Splenic contraction can increase PCV by 10 to 15%. Absolute polycythemia is an increased total hemoglobin/RBC mass with normal plasma volume. Absolute polycythemia can be a primary myeloproliferative disorder ...
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https://www.encyclo.co.uk/local/22445

a condition in which there are too many red blood cells in the blood circulation.
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https://www.stanfordchildrens.org/en/topic/default?id=glossary---pregnancy-
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