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

Heath Hembree was to receive a platelet-rich plasma injection in his pitching elbow Tuesday, manager Alex Cora announced at the end of his pregame chat with reporters. Matt Porter,, "Red Sox injury updates on Heath Hembree and Steven Wright," 6 Aug. 2019 There, blood is drawn and centrifuged for at least 15 minutes at 2,200 to 2,500 rpm to separate the T cells from the plasma, platelets, and the rest. Charles Graeber, WIRED, "How Scientists Built a ‘Living Drug’ to Beat Cancer," 25 July 2019 Jones was donating what’s known as platelets, tiny blood cells the body creates to clot and stop bleeding. Christopher Harress |, al, "Mobile in need as national blood shortage ‘worst’ in 15 years," 25 July 2019 Her platelets — clotting cells within the blood — were dwindling. Kate Thayer,, "Save a life in the next few days. Red Cross asks for blood platelet donations amid Chicago shortage.," 26 June 2019 According to the Mayo Clinic, ITP happens when the immune system mistakenly attacks and destroys platelets, which are cell fragments that help blood clot. Christopher Brito, CBS News, "Once afraid of IVs, girl invents teddy bear pouches to hide them," 14 June 2019 When someone donates blood, it is separated into different components, including plasma, platelets and red blood cells, said Dr. Dennis Williams, the Kentucky Blood Center's medical director. Morgan Watkins, The Courier-Journal, "U of L researchers develop freeze-dried blood that could save soldiers and astronauts," 12 June 2019 For these patients, adding the anti-platelet drug Plavix to usual aspirin therapy drove down some serious risks, but increased the chances of bleeding events. Melissa Healy,, "To prevent recurrent strokes, should aspirin have a wingman? Maybe not," 17 May 2018 The Knee Institute employs breakthrough procedures like umbilical (never embryonic) stem cells and PRP (platelet rich plasma), along with a personalized physical therapy regimen, to help the body heal itself. Joyce Wiswell For The Knee Institute, Detroit Free Press, "Back to basics – with new procedures – enhances pain relief," 7 May 2018

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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Last Updated

9 Aug 2019

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Time Traveler for platelet

The first known use of platelet was in 1888

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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

Comments on platelet

What made you want to look up platelet? Please tell us where you read or heard it (including the quote, if possible).


not constant or steady

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