platelet -
A small colorless disk-shaped particle found in the blood of mammals, which plays an important role in the formation of blood clots.
Wikipedia
Platelets, or thrombocytes (from Greek θρόμβος — «clot» and κύτος — «cell»), are big, regularly-shaped clear cell fragments (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 normally just 5 to 9 days.
OmegaWiki Dictionary
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platelet A type of blood cell that helps prevent bleeding by causing blood clots to form.
