an abnormal condition of the blood characterized by an increase in the number of red blood cells. It can occur as a primary disease of unknown cause (polycythaemia vera or erythraemia) or in association with respiratory or circulatory diseases


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  • Polycythemia

    polycythemia pol·y·cy·the·mi·a (pŏl’ē-sī-thē’mē-ə) n. A condition characterized by an abnormal increase in the number of red blood cells in the blood. Also called erythrocythemia, hypercythemia, hypererythrocythemia, hyperglobulia.

  • Polycythemia hypertonica

    polycythemia hypertonica polycythemia hy·per·ton·i·ca (hī’pər-tŏn’ĭ-kə) n. Polycythemia associated with hypertension, but without splenomegaly.

  • Polycythemia rubra

    polycythemia rubra polycythemia ru·bra (rōō’brə) n. See erythremia.

  • Polycythemia vera

    polycythemia vera polycythemia ve·ra (vēr’ə) n. See erythremia.

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