plate·let   (plāt'lĭt)    n.  A minute, nonnucleated, disklike cytoplasmic body found in the blood plasma of mammals that is derived from a megakaryocyte and functions to promote blood clotting. Also called blood platelet, thrombocyte.

platelet 

Main Entry: plate·let
Pronunciation: 'plAt-l&t
Function: noun
: a minute colorless anucleate disklike body of mammalian blood that is derived fromfragments of megakaryocyte cytoplasm, that is released from the bone marrow into the blood, and that assists in blood clotting by adhering to other platelets and to damaged epithelium called alsoblood platelet, thrombocyte

platelet plate·let (plāt'lĭt)
n.
A minute, irregularly shaped, disklike cytoplasmic body found in blood plasma that promotes blood clotting and has no definite nucleus, no DNA, and no hemoglobin. Also called blood platelet, thrombocyte.