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Definition

noun

A condition in which there is a high platelet count in the blood.

Supplement

Increase in platelet levels may be seen in individuals with myeloproliferative disease, hemorrhage, iron deficiency, and hyposplenism.

Word origin: thrombocyte + Greek -osis (an increase, a condition).

Compare: thrombocytopenia.
See also: lymphocytosis, erythrocytosis.