essential thrombocytosisListen to pronunciation(eh-SENT-shul THROM-boh-sy-TOH-sis)An increased number of thrombocytes (platelets) in the blood, without a known cause. Also called essential thrombocythemia.Search NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#