plate·​let | \ ˈplāt-lət How to pronounce platelet (audio) \

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

Examples of platelet in a Sentence

Recent Examples on the Web His recent platelet transfusion was delayed because of the shortage — luckily for just a few hours. Jon Lapook, CBS News, 6 July 2021 The study not only looked at blood clots but also thrombocytopenia, which is a condition characterized by low platelet counts and CVST, which is blood clots in the brain. Gabriela Miranda, USA TODAY, 27 Aug. 2021 Health officials learned of 15 cases of a rare blood clot in conjunction with a platelet condition out of more than 8 million doses administered. Matt Delong, Star Tribune, 1 July 2021 The cases of cerebral venous sinus thrombosis, combined with a low platelet condition that can cause excessive bleeding, have not been directly linked to the vaccine. Erin Allday, San Francisco Chronicle, 13 Apr. 2021 Researchers estimated that of out of 10 million people vaccinated with the AstraZeneca shot, about 107 would be hospitalized or die because of low platelet counts — about one-ninth of the risk of the same conditions in the infected., 27 Aug. 2021 Other options to consider would be hyaluronic acid injections and platelet-rich plasma. Dr. Keith Roach, oregonlive, 20 Aug. 2021 Canha received platelet-rich plasma injections in both hips during his IL stint. Matt Kawahara, San Francisco Chronicle, 17 July 2021 After 11 days, with her husband vomiting and his platelet count still dangerously low, the Lake County woman checked him out against medical advice and drove him to a hospital in Tavares. Kate Santich,, 23 July 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'platelet.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of platelet

1888, in the meaning defined above

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Time Traveler for platelet

Time Traveler

The first known use of platelet was in 1888

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Dictionary Entries Near platelet



plate letter

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Last Updated

24 Sep 2021

Cite this Entry

“Platelet.” Dictionary, Merriam-Webster, Accessed 28 Sep. 2021.

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More Definitions for platelet



English Language Learners Definition of platelet

: a small, round, thin blood cell that helps blood to stop flowing from a cut by becoming thick and sticky


plate·​let | \ ˈplāt-lət How to pronounce platelet (audio) \

Kids Definition of platelet

: one of the tiny colorless disk-shaped bodies of the blood that assist in blood clotting


plate·​let | \ ˈplāt-lət How to pronounce platelet (audio) \

Medical Definition of platelet

: 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

More from Merriam-Webster on platelet

Britannica English: Translation of platelet for Arabic Speakers Encyclopedia article about platelet


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