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 All blood and platelet donations are tested for COVID-19 antibodies, officials said. Karie Angell Luc,, "Blood drive held in Buffalo Grove after one from earlier this summer canceled over COVID-19 concerns," 8 Sep. 2020 Puk was diagnosed with shoulder inflammation in July after seeing orthopedic surgeon Dr. Neal ElAttrache and received injections of platelet-rich plasma and cortisone. Matt Kawahara,, "A’s shut down A.J. Puk again with shoulder issue," 7 Sep. 2020 Megakaryon, a Japanese company creating blood products from stem cells, advised by Dr. Eto, is preparing for a 2021 clinical trial to treat patients with low platelet counts. Nora Eckert, WSJ, "As Covid-19 Depletes Blood Supplies, Scientists Test an Alternative," 14 Aug. 2020 The prized prospect received both cortisone and platelet-rich plasma injections. Michael Wagaman, Star Tribune, "A's top Rangers 6-4, win 5th straight behind Olson's 2 HRs," 5 Aug. 2020 There is new evidence that the virus also attacks platelet-producing cells, called megakaryocytes, in the lungs. Sharon Begley, STAT, "Watch: From nose to toe, the Covid-19 virus attacks like no other ‘respiratory’ infection," 26 June 2020 After concerns about her own breathing and platelet count during delivery, Rocca had to wait until the day after birth before she was allowed to take Isabela in her arms. Marc Stein, New York Times, "Leandro Barbosa’s Family Grew During the Pandemic," 27 Apr. 2020 Jung has seen the same happen in ferrets with a virus that causes loss of white blood cells called platelets. Jon Cohen, Science | AAAS, "Mice, hamsters, ferrets, monkeys. Which lab animals can help defeat the new coronavirus?," 13 Apr. 2020 The plan is to use the New York Blood Center, which normally coordinates blood, platelet, and bone marrow donations, as a sort of clearing house for the plasma. John Timmer, Ars Technica, "New York hospitals will trial using antibodies to treat coronavirus cases," 27 Mar. 2020

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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Last Updated

23 Sep 2020

Cite this Entry

“Platelet.” Dictionary, Merriam-Webster, Accessed 24 Sep. 2020.

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More Definitions for platelet


How to pronounce platelet (audio)

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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