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: a small, round, thin blood cell that helps blood to stop flowing from a cut by becoming thick and sticky
Full Definition of PLATELET
: a minute flattened body (as of ice or a mineral); especially: a minute colorless disklike body of mammalian blood that assists in blood clotting by adhering to other platelets and to damaged epithelium —called also blood platelet, thrombocyte
: a minute colorless anucleate disklike body of mammalian blood that is derived from fragments 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 also blood platelet, thrombocyte
Small, colourless, irregular blood cell crucial in coagulation. Produced in bone marrow and stored in the spleen, platelets accumulate to block a cut in a blood vessel and provide a surface for fibrin strands to adhere to, contract to pull the strands together, and take part in the conversion sequence of coagulation factors. They also store and transport several chemicals.