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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