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[pleyt-lit] /ˈpleɪt lɪt/
noun, Cell Biology
a small platelike body, especially a blood platelet.
Origin of platelet
1890-95; plate1 + -let Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for platelets
  • So the mosquito is equipped with a powerful enzyme in her saliva to disable the platelets.
  • Then they inject the concentrated platelets at the site of the patient's injury.
  • Electron microscopy turned up no sign of the platelets that would normally gather in a clot.
  • The results are single-layer films composed of many platelets.
  • After a pint of blood is collected, it is processed into its transfusible components: plasma, platelets and red blood cells.
  • That's in contrast to older blood thinners that work by preventing platelets from sticking together.
  • Not to belabor the point, but my stepson also still has platelets that do a decent job of knitting surface wounds without factor.
  • One function produces a substance that makes the tiny wound-plugging blood cells called platelets clump.
  • With platelet disorders, there may be too many or too few platelets, or platelets that do not function well.
  • Thrombocytopenia is any disorder in which there is an abnormally low amount of platelets.
British Dictionary definitions for platelets


a minute cell occurring in the blood of vertebrates and involved in clotting of the blood Formerly called thrombocyte
Word Origin
C19: a small plate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for platelets



1895, formed in English from plate + diminutive suffix -let.

Online Etymology Dictionary, © 2010 Douglas Harper
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platelets in Medicine

platelet plate·let (plāt'lĭt)
A minute, irregularly shaped, disklike cytoplasmic body found in blood plasma that promotes blood clotting and has no definite nucleus, no DNA, and no hemoglobin. Also called blood platelet, thrombocyte.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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platelets in Science
Any of the numerous small, round cell fragments found in the blood of mammals that function in the clotting of blood. Platelets contain no nuclei and are formed in the bone marrow from precursor cells called megakaryocytes. Platelets contribute to the coagulation process by adhering to damaged blood vessels, fibrinogen, and other platelets. An inadequate number of platelets leads to uncontrolled bleeding.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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platelets in Culture
platelets [(playt-luhts)]

Small, flat disks in the blood that aid in clotting.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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