platelet

noun

plate·​let ˈplāt-lət How to pronounce platelet (audio)
: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Humans Some products are infused with exosomes created from human stem cells or platelets from blood. Victoria Moorhouse, Allure, 1 Oct. 2025 There are many ways to make a difference, like donating blood or platelets, volunteering your time, or showing up for a friend. Maureen Carrig, CNBC, 30 Sep. 2025 But, after the initial tests, we were told that there would be no chemo that day, because Jim’s platelet count was low. Ann Patchett, New Yorker, 29 Sep. 2025 The researchers believe that the benefit likely comes from aspirin acting in several ways – by reducing inflammation and inhibiting platelet function and tumor growth. New Atlas, 18 Sep. 2025 See All Example Sentences for platelet

Word History

First Known Use

1888, in the meaning defined above

Time Traveler
The first known use of platelet was in 1888

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Cite this Entry

“Platelet.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/platelet. Accessed 6 Oct. 2025.

Kids Definition

platelet

noun
plate·​let ˈplāt-lət How to pronounce platelet (audio)
: one of the tiny colorless disk-shaped bodies of the blood of mammals that assist in blood clotting

Medical Definition

platelet

noun
plate·​let ˈplāt-lət How to pronounce platelet (audio)
: 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

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