thrombocythemia

noun
throm·bo·cy·the·mia
variants: or chiefly British thrombocythaemia \ˌthräm-bō-ˌsī-ˈthē-mē-ə \

Medical Definition of thrombocythemia 

: a myeloproliferative disorder marked especially by an abnormal chronic increase in the number of circulating platelets

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