thrombocytosis

noun
throm·​bo·​cy·​to·​sis | \ ˌthräm-bə-ˌsī-ˈtō-səs \
plural thrombocytoses\ -​ˈtō-​sēz \

Medical Definition of thrombocytosis

: increase and especially abnormal increase in the number of platelets in the blood that typically occurs in association with a myeloproliferative disorder (as thrombocythemia or chronic myelogenous leukemia) or as a nonspecific response to an underlying disorder or disease (as a systemic infection) also : thrombocythemia

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to gather or build up little by little

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