thumb|250px|Two platelets (purple) under a light microscope (40x) from a peripheral blood smear surrounded by red blood cells. Platelets, or thrombocytes (from Greek θρόμβος — «clot» and κύτος — «cell»), are small, irregularly-shaped anuclear cells (i.e. cells that do not have a nucleus containing DNA), 2-3 µm in diameter, which are derived from fragmentation of precursor megakaryocytes.  The average lifespan of a platelet is between 8 and 12 days. Platelets play a fundamental role in hemostasis and are a natural source of growth factors. They circulate in the blood of mammals and are involved in hemostasis, leading to the formation of blood clots.

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