Increase in the number of platelets in the blood which tends to cause clots to form

• Associated with many neoplasms and chronic infections and other diseases

Wiktionary Word definitions in Wiktionary
n. (context medicine English) The condition of having an abnormally high number of thrombocytes (platelets) in the bloodstream; can give a predisposition to thrombosis

WordNet Word definitions in WordNet
n. increase in the number of platelets in the blood which tends to cause clots to form; associated with many neoplasms and chronic infections and other diseases

Wikipedia Word definitions in Wikipedia
Thrombocytosis (or thrombocythemia ) is the presence of high platelet counts in the blood , and can be either primary (also termed essential and caused by a myeloproliferative disease ) or reactive (also termed secondary). Although often symptomless (particularly ...