disorder, myeloproliferative

disorder, myeloproliferative A malignant disease of certain bone marrow cells, including those that give rise to the red blood cells, the granulocyte (types of white blood cells), and the platelets (which are crucial to blood clotting). The four major myeloproliferative disorders are polycythemia vera, myelofibrosis, thrombocythemia, and chronic myeloid leukemia (CML).